CN104243053A

CN104243053A - Input signal processing method and device

Info

Publication number: CN104243053A
Application number: CN201310244007.3A
Authority: CN
Inventors: 李海婷
Original assignee: Huawei Technologies Co Ltd
Current assignee: Chongqing Hanyuan Machinery Co., Ltd.
Priority date: 2013-06-19
Filing date: 2013-06-19
Publication date: 2014-12-24
Anticipated expiration: 2033-06-19
Also published as: CN104243053B

Abstract

The embodiment of the invention discloses an input signal processing method and device. The method comprises the steps of determining the frequency energy ratio parameter value and jamming intensity parameter value of an input signal of the current frame under a preset electromagnetic interference frequency, calculating the filtering regulation parameter value according to the jamming intensity parameter value when the frequency energy ratio parameter value meets the interference control condition, filtering the input signal of the current frame according to the filtering regulation parameter value to obtain a reference signal, and obtaining the final output signal of the input signal of the current frame according to the reference signal. By the adoption of the input signal processing method and device, the input signal of the current frame can be processed through signal analyzing and processing, cost is low, and electromagnetic interference can be effectively eliminated.

Description

A kind of processing method of input signal and relevant apparatus

Technical field

The present invention relates to signal processing technology field, particularly relate to a kind of processing method and relevant apparatus of input signal.

Background technology

Electromagnetic interference (Electromagnetic Interference, EMI), has conducted interference and radiated interference two kinds.Conducted interference to refer to by conducting medium the signal coupling (interference) on an electric network to another electric network.Radiated interference refer to interference source by space its signal coupling (interference) to another electric network.

At present, radio telephone network operator uses time division multiple access (Time Division Multiple Access, TDMA) agreement to operate their network mostly.Although the Radio Network System based on TDMA provides efficient network interworking ability, but audio speech quality can be subject to the impact of TDMA audio-frequency noise, this noise is due in radio communication, and mobile phone wireless radiating circuit and microphone circuit produce to be coupled and cause.

From waveform, electromagnetic interference signal is a class periodic signal, when sample rate is 8KHz, with 37 sampling points for one-period.Owing to comprising 24 frames for transmitting speech in a multi-frame, a frame is used for controlling with road, a frame free time.Therefore an aperiodic means of chaotic signals can be followed after electromagnetic interference signal shows as 25 periodic signals on waveform.From frequency spectrum, electromagnetic interference signal is a strong harmonic interference signals occurred with 217KHZ frequency multiplication.

The most basic method of prevention electromagnetic interference is the shielding carried out between circuit, but do not consider when design due to some equipment or do not carry out shielding due to cost restriction, thus cause in signal, having occurred electromagnetic interference phenomenon, reduce voice communication quality.

Summary of the invention

The embodiment of the present invention provides a kind of incoming signal processing method and device, and the mode by signal transacting is analyzed input signal, and processes to remove electromagnetic interference to signal according to analysis result.

First aspect, embodiments provides a kind of incoming signal processing method, comprising:

Determine that the frequency domain energy of the input signal of present frame under the electromagnetic interference frequency preset is than parameter value and interference strength parameter value;

When described frequency domain energy interference more satisfied with parameter value controlled condition, according to described interference strength parameter value calculation filtering regulation and control parameter value;

According to described filtering regulation and control parameter value, filtering is carried out to the input signal of described present frame and obtain reference signal;

The final output signal of the input signal of described present frame is obtained according to described reference signal.

In conjunction with first aspect, in the implementation that the first is possible, described determine the input signal of present frame preset electromagnetic interference frequency under frequency domain energy than parameter value and interference strength parameter value before, described method also comprises:

Whether detect described present frame is speech frame;

When detecting that described present frame is speech frame, just perform described determine the input signal of present frame preset electromagnetic interference frequency under frequency domain energy than parameter value and interference strength parameter value;

Detecting that described present frame is not speech frame, determine the interference strength parameter value of the input signal of described present frame, filtering regulation and control parameter value is obtained according to described interference strength parameter value, and according to the described filtering regulation and control parameter value calculated, filtering is carried out to the input signal of described present frame and obtain reference signal, the final output signal of the input signal of described present frame is obtained according to described reference signal.

In conjunction with first aspect, or the first possible implementation of first aspect, in the implementation that the second is possible, described method also comprises:

When described frequency domain energy does not meet interference controlled condition than parameter value, the input signal of described present frame is defined as reference signal;

The final output signal of the input signal of described present frame is obtained according to the described reference signal determined.

In conjunction with first aspect, or the first possible implementation of first aspect, or the implementation that the second of first aspect is possible, in the implementation that the third is possible, described determine the input signal of present frame preset electromagnetic interference frequency under frequency domain energy than in parameter value and interference strength parameter value, determine that frequency domain energy is than parameter value, comprising:

Determine the frequency domain amplitude spectrum of the input signal of described present frame;

Obtain the first parameter value according to described frequency domain amplitude spectrum, described first parameter value comprises: the mean value of described electromagnetic interference frequency and the spectrum energy of harmonic frequency in the frequency domain amplitude spectrum of the input signal of described present frame thereof or the weighted average obtained according to preset weight coefficient; Or the mean value comprising described electromagnetic interference frequency and the spectrum energy of harmonic frequency in the frequency domain amplitude spectrum of the input signal of described present frame in pre-set frequency band thereof or the weighted average obtained according to preset weight coefficient;

Obtain the second parameter value according to described frequency domain amplitude spectrum, described second parameter value comprises: the mean value of half frequency of described electromagnetic interference frequency and the spectrum energy of the odd harmonic frequencies of half frequency in the frequency domain amplitude spectrum of the input signal of described present frame or the weighted average obtained according to preset weight coefficient; Or the mean value of the spectrum energy in half frequency of described electromagnetic interference frequency and the pre-set frequency band of the odd harmonic frequencies of half frequency in the frequency domain amplitude spectrum of the input signal of described present frame or the weighted average obtained according to preset weight coefficient;

The frequency domain energy obtaining the input signal of described present frame according to the ratio of described first parameter value and described second parameter value compares parameter value.

In conjunction with the third possible implementation of first aspect, in the 4th kind of possible implementation, describedly obtain the first parameter value according to described frequency domain amplitude spectrum, comprising:

Calculate the sampling point of described electromagnetic interference frequency and harmonic frequency correspondence in the frequency domain amplitude spectrum of the input signal of described present frame thereof, determine the spectrum energy of each sampling point in the frequency domain amplitude spectrum of the input signal of described present frame, and using the mean value of the spectrum energy of each sampling point determined as the first parameter value;

Describedly obtain the second parameter value according to described frequency domain amplitude spectrum, comprising:

Calculate the sampling point of half frequency of described electromagnetic interference frequency and the odd harmonic frequencies of half frequency correspondence in the frequency domain amplitude spectrum of the input signal of described present frame, determine the spectrum energy of each sampling point in the frequency domain amplitude spectrum of the input signal of described present frame, and using the mean value of the spectrum energy of each sampling point determined as the second parameter value.

In conjunction with the third possible implementation of first aspect, or the 4th of first aspect the kind of possible implementation, in the 5th kind of possible implementation, the described ratio according to described first parameter value and described second parameter value obtains the frequency domain energy of the input signal of described present frame than parameter value, comprising:

Using the initial frequency-domain energy ratio parameter value of the ratio of described first parameter value and described second parameter value as the input signal of described present frame;

To the smoothing process of described initial frequency-domain energy ratio parameter value, it comprises: being averaged than parameter value by the frequency domain energy of described initial frequency-domain energy ratio parameter value and the M frame processed calculates, and described M is positive integer;

Initial frequency-domain energy ratio parameter value after smoothing processing is compared parameter value as the frequency domain energy of the input signal of described present frame.

In conjunction with first aspect, or the first possible implementation of first aspect, or the implementation that the second of first aspect is possible, or the third possible implementation of first aspect, or the 4th of first aspect the kind of possible implementation, or the 5th of first aspect the kind of possible implementation, in the 6th kind of possible implementation, described determine the input signal of present frame preset electromagnetic interference frequency under frequency domain energy than in parameter value and interference strength parameter value, determine interference strength parameter value, comprising:

According to the frequency domain amplitude spectrum of the input signal of described present frame, to described electromagnetic interference frequency and harmonic frequency, the spectrum energy in the frequency domain amplitude spectrum of the input signal of described present frame carries out read group total, using the interference strength parameter value of the result of read group total as the input signal of described present frame;

Or,

According to the frequency domain amplitude spectrum of the input signal of described present frame, to described electromagnetic interference frequency and harmonic frequency, the spectrum energy in the frequency domain amplitude spectrum of the input signal of described present frame is averaging calculating, using the interference strength parameter value of the result of average computation as the input signal of described present frame;

Or,

According to the frequency domain amplitude spectrum of the input signal of described present frame, in pre-set frequency band, to described electromagnetic interference frequency and harmonic frequency, the spectrum energy in the frequency domain amplitude spectrum of the input signal of described present frame carries out read group total, using the interference strength parameter value of the result of read group total as the input signal of described present frame;

Or,

According to the frequency domain amplitude spectrum of the input signal of described present frame, in pre-set frequency band, to described electromagnetic interference frequency and harmonic frequency, the spectrum energy in the frequency domain amplitude spectrum of the input signal of described present frame is averaging calculating, using the interference strength parameter value of the result of average computation as the input signal of described present frame.

In conjunction with first aspect, or the first possible implementation of first aspect, or the implementation that the second of first aspect is possible, or the third possible implementation of first aspect, or the 4th of first aspect the kind of possible implementation, or the 5th of first aspect the kind of possible implementation, or the 6th of first aspect the kind of possible implementation, in the 7th kind of possible implementation, described when described frequency domain energy interference more satisfied with parameter value controlled condition, according to described interference strength parameter value calculation filtering regulation and control parameter value, comprise:

If described frequency domain energy is more than or equal to default first threshold than parameter value, described frequency domain energy interference more satisfied with parameter value controlled condition, compares described interference strength parameter value and the least interference intensity level preset and maximum interference intensity level;

When described interference strength parameter value is less than or equal to described least interference intensity level, default regulation and control parameter minimum value is regulated and controled parameter value as filtering;

When described interference strength parameter value is more than or equal to described maximum interference intensity level, default regulation and control parameter maximum is regulated and controled parameter value as filtering;

When described interference strength parameter value is greater than described least interference intensity level, and when being less than described maximum interference intensity level, calculate described filtering regulation and control parameter value according to preset regulation and control parameter calculation formula.

In conjunction with first aspect, or the first possible implementation of first aspect, or the implementation that the second of first aspect is possible, or the third possible implementation of first aspect, or the 4th of first aspect the kind of possible implementation, or the 5th of first aspect the kind of possible implementation, 6th kind of possible implementation of first aspect, or the 7th of first aspect the kind of possible implementation, in the 8th kind of possible implementation, obtain the final output signal of the input signal of described present frame according to reference signal, comprising:

Calculate the ratio of the energy of the input signal of described present frame and the energy of described reference signal;

If the ratio of described energy is greater than default Second Threshold, then estimate according to the signal Output rusults of the K frame processed the final output signal obtaining the input signal of described present frame;

If the ratio of described energy is less than or equal to described default Second Threshold, then judge whether former frame is idle frame, and judge whether the value of hangover counter is greater than 0;

If former frame is the value of idle frame or hangover counter be greater than 0, then estimate according to the signal Output rusults of the K frame processed the final output signal obtaining the input signal of described present frame;

If former frame is not for idle frame and the value of hangover counter equals 0, then using the final output signal of described reference signal as the input signal of described present frame;

Wherein, for representing that Frame is the hangover frame of idle frame when the value of described hangover counter is greater than 0.

In conjunction with first aspect, or the first possible implementation of first aspect, or the implementation that the second of first aspect is possible, or the third possible implementation of first aspect, or the 4th of first aspect the kind of possible implementation, or the 5th of first aspect the kind of possible implementation, 6th kind of possible implementation of first aspect, or in the 7th of first aspect the kind of possible implementation, in the 9th kind of possible implementation, obtain the final output signal of the input signal of described present frame according to reference signal, comprising:

If the ratio of described energy is greater than the average of the energy ratio of the N frame processed, and the average of the energy ratio of the N frame processed is when being less than the 3rd threshold value, then estimate the final output signal of the input signal of described present frame according to the signal Output rusults of the K frame processed;

If the ratio of described energy is less than or equal to the average of the energy ratio of the N frame processed, or the average of the energy ratio of the N frame processed is when being more than or equal to the 3rd threshold value, judge whether former frame is idle frame further, and whether the value of the counter that judges to trail is greater than 0;

In conjunction with the 8th kind of possible implementation of first aspect, or the 9th of first aspect the kind of possible implementation, in the tenth kind of possible implementation, described method also comprises:

Judge whether described present frame is idle frame;

If idle frame, by preset idle frame traffic sign placement for effectively to represent that described present frame is for idle frame, and the length of hangover counter is set to the length threshold preset;

If busy frame, be invalid to represent that described present frame is busy frame by described preset idle frame traffic sign placement, and the value of the length of described hangover counter is subtracted one;

Wherein, describedly judge whether described present frame is that idle frame comprises:

When the ratio of the energy of the input signal of the described present frame calculated and the energy of described reference signal is greater than default Second Threshold; Or when the energy of input signal of described present frame calculated and the ratio of the energy of described reference signal are greater than the average of the energy ratio parameter value of the N frame processed, and the average of the energy ratio parameter value of the N frame processed is when being less than the 3rd threshold value, determine that described present frame is idle frame, otherwise, be busy frame.

Second aspect, the embodiment of the present invention additionally provides the processing method of another kind of input signal, comprising:

When detecting that present frame is non-speech frame, determine the interference strength parameter value of the input signal of described present frame;

Described interference strength parameter value is calculated, obtains filtering regulation and control parameter value, and filtering is carried out to the input signal of described present frame obtain reference signal according to the filtering regulation and control parameter value calculated;

In conjunction with second aspect, in the implementation that the first is possible, the described final output signal obtaining the input signal of described present frame according to described reference signal, comprising:

In conjunction with second aspect, in the implementation that the second is possible, describedly according to described reference signal, estimation process is carried out to the input signal of described present frame, obtains the final output signal of the input signal of described present frame, comprising:

If the ratio of described energy is greater than the average of the energy ratio parameter value of the N frame processed, and the average of the energy ratio of the N frame processed is when being less than the 3rd threshold value, then estimate the final output signal of the input signal of described present frame according to the signal Output rusults of the K frame processed;

If described energy ratio parameter value is less than or equal to the average of the energy ratio parameter value of the N frame processed, or the average of the energy ratio parameter value of the N frame processed is when being more than or equal to the 3rd threshold value, judge whether former frame is idle frame further, and whether the value of the counter that judges to trail is greater than 0;

The third aspect, the embodiment of the present invention additionally provides a kind of input signal processing unit, comprising:

Determination module, for determining that the frequency domain energy of the input signal of present frame under described electromagnetic interference frequency is than parameter value and interference strength parameter value;

Filtration module, for when described frequency domain energy interference more satisfied with parameter value controlled condition, according to described interference strength parameter value calculation filtering regulation and control parameter value, and according to described filtering regulation and control parameter value, filtering is carried out to the input signal of described present frame and obtain reference signal;

Processing module, for obtaining the final output signal of the input signal of described present frame according to described reference signal.

In conjunction with the third aspect, in the implementation that the first is possible, also comprise:

Whether detection module is speech frame for detecting described present frame;

Notification module, for when the testing result of described detection module is for being speech frame, notifies that the frequency domain energy of the input signal of described determination module determination present frame under the electromagnetic interference frequency preset is than parameter value and interference strength parameter value;

Non-speech frame processing module, for when the testing result of described detection module is for being not speech frame, determine the interference strength parameter value of the input signal of described present frame, filtering regulation and control parameter value is obtained according to described interference strength parameter value, and according to the described filtering regulation and control parameter value calculated, filtering is carried out to the input signal of described present frame and obtain reference signal, the final output signal of the input signal of described present frame is obtained according to described reference signal.

In conjunction with the third aspect, or the first possible implementation of the third aspect, in the implementation that the second is possible, described processing module, also for when described frequency domain energy does not meet interference controlled condition than parameter value, the input signal of described present frame is defined as reference signal; The final output signal of the input signal of described present frame is obtained according to the described reference signal determined.

In conjunction with the third aspect, or the first possible implementation of the third aspect, or the implementation that the second of the third aspect is possible, in the implementation that the third is possible, described determination module comprises:

Amplitude spectrum determining unit, for determining the frequency domain amplitude spectrum of the input signal of described present frame;

First parameter calculation unit, for obtaining the first parameter value according to described frequency domain amplitude spectrum, described first parameter value comprises: the mean value of described electromagnetic interference frequency and the spectrum energy of harmonic frequency in the frequency domain amplitude spectrum of the input signal of described present frame thereof or the weighted average obtained according to preset weight coefficient, or the mean value comprising the spectrum energy in described electromagnetic interference frequency and the pre-set frequency band of harmonic frequency in the frequency domain amplitude spectrum of the input signal of described present frame thereof or the weighted average obtained according to preset weight coefficient;

Second parameter calculation unit, for obtaining the second parameter value according to described frequency domain amplitude spectrum, described second parameter value comprises: the mean value of half frequency of described electromagnetic interference frequency and the spectrum energy of the odd harmonic frequencies of half frequency in the frequency domain amplitude spectrum of the input signal of described present frame or the weighted average obtained according to preset weight coefficient, or the mean value of the spectrum energy in half frequency of described electromagnetic interference frequency and the pre-set frequency band of the odd harmonic frequencies of half frequency in the frequency domain amplitude spectrum of the input signal of described present frame or the weighted average obtained according to preset weight coefficient,

Energy ratio parameter determining unit, compares parameter value for the frequency domain energy obtaining the input signal of described present frame according to the ratio of described first parameter value and described second parameter value.

In conjunction with the third possible implementation of the third aspect, in the 4th kind of possible implementation,

Described first parameter calculation unit, specifically for calculating the sampling point of described electromagnetic interference frequency and harmonic frequency correspondence in the frequency domain amplitude spectrum of the input signal of described present frame thereof, determine the spectrum energy of each sampling point in the frequency domain amplitude spectrum of the input signal of described present frame, and using the mean value of the spectrum energy of each sampling point determined as the first parameter value;

Described second parameter calculation unit, specifically for the sampling point that the odd harmonic frequencies of half frequency and half frequency that calculate described electromagnetic interference frequency is corresponding in the frequency domain amplitude spectrum of the input signal of described present frame, determine the spectrum energy of each sampling point in the frequency domain amplitude spectrum of the input signal of described present frame, and using the mean value of the spectrum energy of each sampling point determined as the second parameter value.

In conjunction with the third possible implementation of the third aspect, or the 4th of the third aspect the kind of possible implementation, in the 5th kind of possible implementation, described energy ratio parameter determining unit, specifically for using the initial frequency-domain energy ratio parameter value of the ratio of described first parameter value and described second parameter value as the input signal of described present frame; To the smoothing process of described initial frequency-domain energy ratio parameter value, it comprises: being averaged than parameter value by the frequency domain energy of described initial frequency-domain energy ratio parameter value and the M frame processed calculates, and described M is positive integer; Initial frequency-domain energy ratio parameter value after smoothing processing is compared parameter value as the frequency domain energy of the input signal of described present frame.

In conjunction with the third aspect, or the first possible implementation of the third aspect, or the implementation that the second of the third aspect is possible, or the third possible implementation of the third aspect, or the 4th of the third aspect the kind of possible implementation, or the 5th of the third aspect the kind of possible implementation, in the 6th kind of possible implementation, described determination module comprises:

Interference strength determining unit, for the frequency domain amplitude spectrum of the input signal according to described present frame, to described electromagnetic interference frequency and harmonic frequency, the spectrum energy in the frequency domain amplitude spectrum of the input signal of described present frame carries out read group total, using the interference strength parameter value of the result of read group total as the input signal of described present frame;

Or,

For the frequency domain amplitude spectrum of the input signal according to described present frame, to described electromagnetic interference frequency and harmonic frequency, the spectrum energy in the frequency domain amplitude spectrum of the input signal of described present frame is averaging calculating, using the interference strength parameter value of the result of average computation as the input signal of described present frame;

Or,

For the frequency domain amplitude spectrum of the input signal according to described present frame, in pre-set frequency band, to described electromagnetic interference frequency and harmonic frequency, the spectrum energy in the frequency domain amplitude spectrum of the input signal of described present frame carries out read group total, using the interference strength parameter value of the result of read group total as the input signal of described present frame;

Or,

For the frequency domain amplitude spectrum of the input signal according to described present frame, in pre-set frequency band, to described electromagnetic interference frequency and harmonic frequency, the spectrum energy in the frequency domain amplitude spectrum of the input signal of described present frame is averaging calculating, using the interference strength parameter value of the result of average computation as the input signal of described present frame.

In conjunction with the third aspect, or the first possible implementation of the third aspect, or the implementation that the second of the third aspect is possible, or the third possible implementation of the third aspect, or the 4th of the third aspect the kind of possible implementation, or the 5th of the third aspect the kind of possible implementation, or the 6th of the third aspect the kind of possible implementation, in the 7th kind of possible implementation, described filtration module comprises:

Comparing unit, for when described frequency domain energy is more than or equal to default first threshold than parameter value, described frequency domain energy interference more satisfied with parameter value controlled condition, compares described interference strength parameter value and the least interference intensity level preset and maximum interference intensity level;

Regulation and control parameter value-determining unit, for when described interference strength parameter value is less than or equal to described least interference intensity level, regulates and controls parameter value using default regulation and control parameter minimum value as filtering; When described interference strength parameter value is more than or equal to described maximum interference intensity level, default regulation and control parameter maximum is regulated and controled parameter value as filtering; When described interference strength parameter value is greater than described least interference intensity level, and when being less than described maximum interference intensity level, calculate described filtering regulation and control parameter value according to preset regulation and control parameter calculation formula;

Filter unit, obtains reference signal for carrying out filtering according to described filtering regulation and control parameter value to the input signal of described present frame.

In conjunction with the third aspect, or the first possible implementation of the third aspect, or the implementation that the second of the third aspect is possible, or the third possible implementation of the third aspect, or the 4th of the third aspect the kind of possible implementation, or the 5th of the third aspect the kind of possible implementation, or the 6th of the third aspect the kind of possible implementation, or the 7th of the third aspect the kind of possible implementation, in the 8th kind of possible implementation, described processing module comprises:

First energy ratio parameter value computing unit, for the ratio of the energy of the energy and described reference signal that calculate the input signal of described present frame;

First processing unit, if be greater than default Second Threshold for the ratio of described energy, then estimates according to the signal Output rusults of the K frame processed the final output signal obtaining the input signal of described present frame; If the ratio of described energy is less than or equal to described default Second Threshold, then judge whether former frame is idle frame, and judge whether the value of hangover counter is greater than 0; If former frame is the value of idle frame or hangover counter be greater than 0, then estimate according to the signal Output rusults of the K frame processed the final output signal obtaining the input signal of described present frame; If former frame is not for idle frame and the value of hangover counter equals 0, then using the final output signal of described reference signal as the input signal of described present frame; Wherein, for representing that Frame is the hangover frame of idle frame when the value of described hangover counter is greater than 0.

In conjunction with the third aspect, or the first possible implementation of the third aspect, or the implementation that the second of the third aspect is possible, or the third possible implementation of the third aspect, or the 4th of the third aspect the kind of possible implementation, or the 5th of the third aspect the kind of possible implementation, or the 6th of the third aspect the kind of possible implementation, in the 9th kind of possible implementation, described processing module comprises:

Second energy ratio parameter value computing unit, for the ratio of the energy of the energy and described reference signal that calculate the input signal of described present frame;

Second processing unit, if the ratio for described energy is greater than the average of the energy ratio of the N frame processed, and the average of the energy ratio of the N frame processed is when being less than the 3rd threshold value, then estimate the final output signal of the input signal of described present frame according to the signal Output rusults of the K frame processed; If the ratio of described energy is less than or equal to the average of the energy ratio of the N frame processed, or the average of the energy ratio of the N frame processed is when being more than or equal to the 3rd threshold value, judge whether former frame is idle frame further, and whether the value of the counter that judges to trail is greater than 0; If former frame is the value of idle frame or hangover counter be greater than 0, then estimate according to the signal Output rusults of the K frame processed the final output signal obtaining the input signal of described present frame; If former frame is not for idle frame and the value of hangover counter equals 0, then using the final output signal of described reference signal as the input signal of described present frame; Wherein, for representing that Frame is the hangover frame of idle frame when the value of described hangover counter is greater than 0.

In conjunction with the 8th kind of possible implementation of the third aspect, the 9th kind of possible implementation of the third aspect, in the tenth kind of possible implementation, described processing module also comprises:

Judging unit, for judging whether described present frame is idle frame;

Updating block, when being idle frame for judged result, by preset idle frame traffic sign placement for effectively to represent that described present frame is for idle frame, and is set to the length threshold preset by the length of hangover counter; If busy frame, be invalid to represent that described present frame is busy frame by described preset idle frame traffic sign placement, and the value of the length of described hangover counter is subtracted one;

Wherein, when described updating block is greater than default Second Threshold specifically for the ratio of the energy of the input signal when the described present frame calculated and the energy of described reference signal; Or when the energy of input signal of described present frame calculated and the ratio of the energy of described reference signal are greater than the average of the ratio of the energy of the N frame processed, and the average of the energy ratio parameter value of the N frame processed is when being less than the 3rd threshold value, determine that described present frame is idle frame, otherwise, be busy frame.

Fourth aspect, the embodiment of the present invention additionally provides the processing unit of another kind of input signal, comprising:

Determination module, for when detecting that present frame is non-speech frame, determines the interference strength parameter value of the input signal of described present frame;

Filtration module, for calculating described interference strength parameter value, obtains filtering regulation and control parameter value; According to the filtering regulation and control parameter value calculated, filtering is carried out to the input signal of described present frame and obtain reference signal;

In conjunction with fourth aspect, in the implementation that the first is possible, described processing module comprises:

First computing unit, for the ratio of the energy of the energy and described reference signal that calculate the input signal of described present frame;

In conjunction with fourth aspect, in the implementation that the second is possible, described processing module comprises:

Second computing unit, for the ratio of the energy of the energy and described reference signal that calculate the input signal of described present frame;

The frequency of the embodiment of the present invention to electromagnetic interference signal common in the input signal of present frame and various kinds of equipment calculates, determine that the filtering regulation and control parameter value of the filter with different noise suppressed degree obtains reference signal to make this filter carry out filtering process according to this filtering regulation and control parameter value to input signal, the final output signal of present frame is obtained again by this reference signal, thus the electromagnetic interference can effectively removed in input signal, reduce speech damage, and farthest remove electromagnetic interference, and computation complexity is low, do not need to adopt shield technology, cost reduces.

Accompanying drawing explanation

In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.

Fig. 1 is the schematic flow sheet of a kind of incoming signal processing method of the embodiment of the present invention;

Fig. 2 is the schematic flow sheet of the another kind of incoming signal processing method of the embodiment of the present invention;

Fig. 3 determines the schematic flow sheet of the frequency domain energy of input signal than wherein a kind of concrete grammar of parameter value in the embodiment of the present invention;

Fig. 4 is the schematic flow sheet of wherein a kind of concrete grammar of the interference strength parameter value of the determination input signal of the embodiment of the present invention;

Fig. 5 is the schematic flow sheet of wherein a kind of concrete grammar of the calculation of filtered regulation and control parameter value of the embodiment of the present invention;

Fig. 6 is the schematic flow sheet obtaining the wherein a kind of concrete grammar outputed signal of the embodiment of the present invention;

Fig. 7 is the schematic flow sheet obtaining the wherein another kind of concrete grammar outputed signal of the embodiment of the present invention;

Fig. 8 is the schematic flow sheet of the processing method of another input signal of the embodiment of the present invention;

Fig. 9 is the structural representation of a kind of input signal processing unit of the embodiment of the present invention;

Figure 10 is the structural representation of the another kind of input signal processing unit of the embodiment of the present invention;

Figure 11 is wherein a kind of concrete structure schematic diagram of the determination module in Figure 10;

Figure 12 is wherein a kind of concrete structure schematic diagram of the filtration module in Figure 10;

Figure 13 is wherein a kind of concrete structure schematic diagram of the processing module in Figure 10;

Figure 14 is the structural representation of the processing unit of another input signal of the embodiment of the present invention;

Figure 15 is the structural representation of a kind of network equipment of the embodiment of the present invention;

Figure 16 is the structural representation of another network equipment of the embodiment of the present invention.

Embodiment

Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.

Refer to Fig. 1, it is the schematic flow sheet of a kind of incoming signal processing method of the embodiment of the present invention, the described method of the embodiment of the present invention can be applicable in communication network, by carrying out to the input signal of present frame the final output signal that signal analysis obtains this input signal, concrete, the described method of the embodiment of the present invention comprises:

S101: determine that the frequency domain energy of the input signal of present frame under the electromagnetic interference frequency preset is than parameter value and interference strength parameter value.

Wherein, in embodiments of the present invention, described frequency domain energy comprises than parameter value: described according to electromagnetic interference frequency and harmonic frequency the spectrum energy in the frequency domain amplitude spectrum of the input signal of described present frame, the parameter value that half frequency of described electromagnetic interference frequency and the spectrum energy of the odd harmonic frequencies of half frequency in the frequency domain amplitude spectrum of the input signal of described present frame calculate, described interference strength parameter value comprises: the parameter value that the spectrum energy in the frequency domain amplitude spectrum of the input signal of described present frame calculates according to half frequency of described electromagnetic interference frequency and the odd harmonic frequencies of half frequency.

In the embodiment of the present invention, the sample rate FS of the input signal of described present frame can be set to 8KHz, carries out sub-frame processing to signal, and frame length is N, then the input signal of present frame is in(n), n=0,1,2 ..., N-1.Described default electromagnetic interference frequency is the frequency of the electromagnetic interference signal of common communication equipment, and this electromagnetic interference frequency is generally 217KHz.

The frequency domain energy of described input signal characterizes in the frequency domain amplitude spectrum of the input signal of described present frame than parameter value, the ratio of spectrum energy between harmonic wave place spectrum energy corresponding to electromagnetic interference frequency preset and harmonic wave.Specifically can calculate in the frequency domain amplitude spectrum of the input signal of described present frame in Whole frequency band, between each harmonic wave place spectrum energy and each harmonic wave of the electromagnetic interference frequency preset, the ratio of spectrum energy, obtains frequency domain energy and compares parameter value; Or calculate in the frequency domain amplitude spectrum of the input signal of described present frame within the scope of pre-set frequency band, between each harmonic wave place spectrum energy and each harmonic wave of the electromagnetic interference frequency preset, the ratio of spectrum energy, obtains frequency domain energy and compares parameter value; Or first the amplitude spectrum energy of described input signal in different frequency bands is multiplied by respectively corresponding weight coefficient, to calculate in the frequency domain amplitude spectrum of the input signal of described present frame within the scope of Whole frequency band or pre-set frequency band again, between each harmonic wave place spectrum energy and each harmonic wave of the electromagnetic interference frequency preset, the ratio of spectrum energy, obtains frequency domain energy and compares parameter value.

The power of electromagnetic interference of described interference strength parameter value for characterizing described input signal and may existing.The spectrum energy sum that described default electromagnetic interference frequency and each harmonic frequency thereof can be used corresponding in the frequency domain amplitude spectrum of the input signal of described present frame is as interference strength parameter value.In addition, also can represent with the mean value of the spectrum energy corresponding in the frequency domain amplitude spectrum of the input signal of described present frame of described default electromagnetic interference frequency and each harmonic frequency thereof, or can also be represented by the frequency domain energy sum corresponding in the frequency domain amplitude spectrum of the input signal of described present frame of the described default electromagnetic interference frequency in a certain preset frequency bands or mean value.

S102: when described frequency domain energy interference more satisfied with parameter value controlled condition, according to described interference strength parameter value calculation filtering regulation and control parameter value.

When frequency domain energy is more than or equal to a certain default frequency domain energy than parameter value threshold value than parameter value, namely meet interference controlled condition.This frequency domain energy is chosen for empirical value than parameter value threshold value, and also can obtain according to data training, its concrete value has occurred can distinguish electromagnetic interference and has been as the criterion.When frequency domain energy is more than or equal to frequency domain energy than parameter value threshold value than parameter value, show that electromagnetic interference occurs; When frequency domain energy is less than frequency domain energy than parameter value threshold value than parameter value, show that electromagnetic interference is enough little or do not have electromagnetic interference.

When frequency domain energy is more than or equal to a certain default frequency domain energy than parameter value threshold value than parameter value, perform described S102 and following S103 to S104.Otherwise, namely show that electromagnetic interference is enough little or do not have electromagnetic interference, the filtering regulation and control parameter value of filter need not be adjusted, filtering can be carried out by filter to the input signal of described present frame.

S103: according to described filtering regulation and control parameter value, filtering is carried out to the input signal of described present frame and obtain reference signal.

The filtering regulation and control parameter value of the filter of the employing in the embodiment of the present invention comprises ρ, after calculating interference strength parameter value, can calculate filtering regulation and control parameter value ρ according to interference strength parameter value, determine ρ value, parameter value ρ can be regulated and controled according to filtering to make such as comb filter etc., calculate the transfer function of comb filter, after carrying out a series of filtering process, finally export reference signal out_tmp(n), comb filter is after obtaining ρ value, and the process obtaining reference signal can adopt existing techniques in realizing.

S104: the final output signal obtaining the input signal of described present frame according to described reference signal.

After obtaining reference signal, the reference signal exported according to filter again in S104 carries out signal transacting, determines the final output signal of the input signal of described present frame.In embodiments of the present invention, obtain the filtering regulation and control parameter value after obtaining reference signal by filter of filter at controlling calculation, the final output signal that the reference signal exported according to filter obtains described present frame can pass through existing techniques in realizing.

Concrete, for described S104, when present frame is busy frame, the final output signal of the input signal of present frame can be exactly described reference signal and out(n)=out_tmp(n), n=0,1,2, N-1, for then obtaining the final output signal of the input signal of described present frame, out(n according to the output signal of the K frame processed during idle frame)=smooth_mem(K*m), wherein, at described smooth_mem(*) in have recorded the output of the K frame processed.Other method can certainly be used to estimate Output rusults during idle frame, as long as ensure the continuity of the frame of estimated output signal and front and back signal.Whether present frame is that idle frame can be determined according to modes such as the sizes of the frequency domain amplitude spectrum capacity volume variance between input signal and reference signal.

S105: when described frequency domain energy does not meet interference controlled condition than parameter value, the input signal of described present frame is defined as reference signal.

S106: the final output signal obtaining the input signal of described present frame according to the described reference signal determined.

Directly described input signal is exported as with reference to signal in described S105, namely obtains reference signal out_tmp(n)=in(n), n=0,1,2 ..., N-1.Then the final output signal of the input signal of described present frame is determined according to this reference signal.In embodiments of the present invention, described S105 to S106 is optional step, namely when not meeting interference controlled condition, can also have other processing modes, such as described input signal is directly exported, or obtain output corresponding to the described input signal of present frame according to the Frame of former frame.

The embodiment of the present invention is based on the frequency of electromagnetic interference signal common in the input signal of present frame and various kinds of equipment, determine that the filtering regulation and control parameter value of the filter with different noise suppressed degree obtains reference signal to carry out filtering process according to this filtering regulation and control parameter value to input signal, the final output signal of present frame is obtained again by this reference signal, thus obtain the final output signal of the electromagnetic interference removed in input signal, reduce speech damage, and farthest remove electromagnetic interference, and computation complexity is low, do not need to adopt shield technology, cost reduces.

Refer to Fig. 2 again, be the schematic flow sheet of the another kind of incoming signal processing method of the embodiment of the present invention, the described method of the embodiment of the present invention can be applicable in communication network device, concrete, and the described method of the embodiment of the present invention comprises:

S201: detect whether present frame is speech frame.

Described present frame comprises the Frame etc. under the application such as the voice communication that communication network device is currently received, described S201 specifically can comprise: carry out voice activation detection to the input signal of present frame, obtain voice activation testing result vad_flag, determine whether described present frame is speech frame according to voice activation testing result, if not speech frame, then perform following S202, if speech frame, just perform following S204 to S209.

Equally, in the embodiment of the present invention, can be set to 8KHz, carry out sub-frame processing to signal to the signal sampling rate FS of the input signal of described present frame, frame length is N, then the input signal that present frame is corresponding is in(n), n=0,1,2 ..., N-1.

S202: when detecting that described present frame is non-speech frame, determine the interference strength parameter value of the input signal of described present frame, obtain filtering regulation and control parameter value according to described interference strength parameter value, and according to the described filtering regulation and control parameter value calculated, the reference signal that filtering obtains non-speech frame is carried out to the input signal of described present frame;

S203: the final output signal obtaining the input signal of described present frame according to the reference signal of described non-speech frame.

In described S202, the power of the electromagnetic interference that described interference strength parameter value may exist for the input signal characterizing described non-speech frame.Default electromagnetic interference frequency (generally can be set to 217KHz) and spectrum energy sum corresponding to each harmonic frequency thereof can be used as interference strength parameter value.In addition, also can represent with the mean value of the electromagnetic interference frequency preset and spectrum energy corresponding to each harmonic frequency thereof, or can also be represented by the spectrum energy sum of the electromagnetic interference frequency in a certain preset frequency bands or average.

S204: when detecting that described present frame is speech frame, determines that the frequency domain energy of the input signal of present frame under the electromagnetic interference frequency preset is than parameter value and interference strength parameter value;

S205: when described frequency domain energy interference more satisfied with parameter value controlled condition, according to described interference strength parameter value calculation filtering regulation and control parameter value;

S206: according to described filtering regulation and control parameter value, filtering is carried out to the input signal of described present frame and obtain reference signal.

S207: the final output signal obtaining the input signal of described present frame according to described reference signal;

S208: when described frequency domain energy does not meet interference controlled condition than parameter value, the input signal of described present frame is defined as reference signal;

S209: the final output signal obtaining the input signal of described present frame according to the described reference signal determined.

Illustrating of described S204 to S209 see the description of S101 to S106 embodiment in above-mentioned first embodiment, can be not repeated herein.

In embodiments of the present invention, in described S202, S206 and S208, all can obtain reference signal in corresponding situation (reference signal of the non-speech frame that the reference signal that filter obtains, filter obtain and using input signal directly as reference signal), and in described S203, S207 and S209, all obtain the final output signal of input signal according to the reference signal in corresponding situation.The final output signal obtaining the input signal of described present frame according to reference signal according to existing techniques in realizing, also can realize according to the mode described in above-described embodiment, is not repeated herein.

The input signal of the embodiment of the present invention to present frame is analyzed, and be speech frame to this signal, non-voice carries out differentiated treatment, frequency again in conjunction with electromagnetic interference signal common in various kinds of equipment calculates, determine that the filtering regulation and control parameter value of the filter with different noise suppressed degree obtains reference signal to carry out filtering process according to this filtering regulation and control parameter value to input signal, the final output signal of present frame is obtained again by this reference signal, thus obtain the final output signal of the electromagnetic interference removed in input signal, reduce speech damage, and farthest remove electromagnetic interference, and computation complexity is low, do not need to adopt shield technology, cost reduces.

Refer to Fig. 3 again, be determine the schematic flow sheet of the frequency domain energy of input signal than wherein a kind of concrete grammar of parameter value in the embodiment of the present invention, the described method of the present embodiment comprises:

S301: the frequency domain amplitude spectrum determining the input signal of present frame.

Concrete, can be 8KHz to the sample rate FS of the input signal of described present frame, carry out sub-frame processing to this input signal, frame length be N, then the input signal of present frame is in(n), n==0,1,2 ..., N-1.The electromagnetic interference frequency preset is 217KHz.

First the input signal of described present frame can be carried out leaf transformation in L point discrete Fourier, L is satisfied is more than or equal to N, and L value can adopt 256.Wherein, when L is greater than N, zero padding operation is carried out to the input signal of present frame, obtains time-domain signal s(n), n=0,1,2 ..., L-1.S(k is denoted as after again transforming to frequency domain), k=0,1,2 ..., L-1, calculate S(k) amplitude spectrum SPD(j) (the frequency domain amplitude spectrum that namely input signal of described present frame is corresponding), j=0,1,2 ..., K/2-1.

In embodiments of the present invention, the frequency-region signal S(k of present frame input signal) corresponding expression formula can be:

S (k) = \frac{1}{L} Σ_{k = 0}^{L - 1} e^{i \frac{2 π}{L} nk} s (n), k = 0,1 \cdot \cdot \cdot, L - 1

The frequency domain amplitude spectrum SPD(j of the input signal of present frame) corresponding expression formula can be:

SPD (j) = \frac{\sqrt{{Re {S (j)}}^{2} + {Im {S (j)}}^{2}}}{A}, j = 0,1 \cdot \cdot \cdot, L / 2 - 1

Wherein, Re{} represents acquisition real, and Im{} represents the imaginary part obtaining plural number, and A is constant.Generally get A=1, but the calculating being convenient to spectrum energy sum in order to the numerical value controlling frequency domain amplitude spectrum can get the constant of A>1 sometimes.

S302: obtain the first parameter value according to described frequency domain amplitude spectrum.

Described first parameter value comprises: the mean value of described electromagnetic interference frequency and the spectrum energy of harmonic frequency in the frequency domain amplitude spectrum of the input signal of described present frame thereof or the weighted average obtained according to preset weight coefficient; Or the mean value comprising described electromagnetic interference frequency and the spectrum energy of harmonic frequency in the frequency domain amplitude spectrum of the input signal of described present frame in pre-set frequency band thereof or the weighted average obtained according to preset weight coefficient;

S303: obtain the second parameter value according to described frequency domain amplitude spectrum.

Described second parameter value comprises: the mean value of half frequency of described electromagnetic interference frequency and the spectrum energy of the odd harmonic frequencies of half frequency in the frequency domain amplitude spectrum of the input signal of described present frame or the weighted average obtained according to preset weight coefficient; Or the mean value of the spectrum energy in half frequency of described electromagnetic interference frequency and the pre-set frequency band of the odd harmonic frequencies of half frequency in the frequency domain amplitude spectrum of the input signal of described present frame or the weighted average obtained according to preset weight coefficient;

Wherein, the computation sequence of described first parameter value and the second parameter value is not construed as limiting, and also can calculate the first parameter value and the second parameter value simultaneously.

S304: the frequency domain energy obtaining the input signal of described present frame according to the ratio of described first parameter value and described second parameter value compares parameter value.

The frequency domain energy of input signal is calculated than parameter value fac_sp, the ratio of frequency domain energy characterizes described present frame input signal than parameter value spectrum energy between harmonic wave place spectrum energy corresponding to the electromagnetic interference frequency preset and harmonic wave according to above-mentioned frequency domain amplitude spectrum.

Wherein, wherein a kind of concrete account form of described S302 can comprise: the sampling point calculating described electromagnetic interference frequency and harmonic frequency correspondence in the frequency domain amplitude spectrum of the input signal of described present frame thereof, determine the spectrum energy of each sampling point in the frequency domain amplitude spectrum of the input signal of described present frame, and using the mean value of the spectrum energy of each sampling point determined as the first parameter value.

And wherein a kind of concrete account form of described S303 can comprise: the sampling point calculating half frequency of described electromagnetic interference frequency and the odd harmonic frequencies of half frequency correspondence in the frequency domain amplitude spectrum of the input signal of described present frame, determine the spectrum energy of each sampling point in the frequency domain amplitude spectrum of the input signal of described present frame, and using the mean value of the spectrum energy of each sampling point determined as the second parameter value.

Concrete, in embodiments of the present invention, calculating frequency domain energy than wherein a kind of expression of parameter value fac_sp can be:

Wherein, frequency domain energy characterizes frequency domain amplitude spectrum sample spacings corresponding to harmonic interval frequency than the described STEP in parameter value expression formula, i=0 wherein, 1,2 ...., f_EMI is default electromagnetic interference frequency, and FS is above-mentioned sample rate, and L is leaf transformation in above-mentioned L point discrete Fourier, round(*) represent round.In above-mentioned expression formula represent and round downwards, mean(*) represent and get average.

A represents the default sampling point of electromagnetic interference frequency in frequency domain amplitude spectrum, b represents the sampling point that half frequency of default electromagnetic interference frequency is corresponding in frequency domain amplitude spectrum,

B = round (\frac{F_{EMI}}{FS} * L * \frac{1}{2}) \cdot

In described S302, calculating the sampling point of described electromagnetic interference frequency and harmonic frequency correspondence in the frequency domain amplitude spectrum of the input signal of described present frame thereof, is calculated by above-mentioned STEP and STEP*i+A to determine.

In described S303, calculating the sampling point of half frequency of described electromagnetic interference frequency and the odd harmonic frequencies of half frequency correspondence in the frequency domain amplitude spectrum of the input signal of described present frame, is then calculated by above-mentioned STEP and STEP*i+B to determine.

In embodiments of the present invention, when the electromagnetic interference frequency preset is 217, therefore, A=7 can be obtained, B=3, namely the electromagnetic interference frequency preset is the 7th sampling point in described frequency domain amplitude spectrum, and half frequency (217/2) of default electromagnetic interference frequency is the 3rd sampling point in described frequency domain amplitude spectrum.In described SPD (STEP*i+A), when i is 0, obtain the spectrum energy of electromagnetic interference frequency in described frequency domain amplitude spectrum preset, when i is 1,2, obtain first harmonic frequency of electromagnetic interference frequency, the spectrum energy of second harmonic frequency in described frequency domain amplitude spectrum respectively, by that analogy.

In like manner, in described STEP*i+B, when i is 0, obtain the spectrum energy of half frequency in described frequency domain amplitude spectrum of the electromagnetic interference frequency preset, when i is 1,2, obtain the first odd harmonic frequencies of half frequency of the electromagnetic interference frequency preset, the spectrum energy of the second odd harmonic frequencies in described frequency domain amplitude spectrum respectively, by that analogy.

In the expression formula of above-mentioned fac_sp, the expression formula of molecule is calculate the first above-mentioned parameter value, and the expression formula of denominator is calculate the second above-mentioned parameter value.

It should be noted that, only list a kind of expression formula of frequency domain energy than parameter value calculating input signal in above-mentioned expression formula, namely pass through the mode of the mean value of the mean value of the described electromagnetic interference frequency of calculating and the spectrum energy of harmonic frequency in the frequency domain amplitude spectrum of the input signal of described present frame thereof, half frequency of described electromagnetic interference frequency and the spectrum energy of the odd harmonic frequencies of half frequency in the frequency domain amplitude spectrum of the input signal of described present frame.In other embodiments, can also adopt such as: frequency domain energy in Whole frequency band can not be calculated than parameter value, and only select the amplitude spectrum in some pre-set frequency band to compare parameter value to calculate frequency domain energy; Or compare parameter value than being multiplied by different weight coefficients to the amplitude spectrum in different frequency bands during parameter value to calculate frequency domain energy at calculating frequency domain energy, wherein, when calculating spectrum energy, be all obtain electromagnetic interference frequency and the sampling point of harmonic frequency in corresponding frequency domain amplitude spectrum thereof by mode similar to the above to determine corresponding spectrum energy.

Further, in embodiments of the present invention, in order to the continuity of influence of fluctuations interframe process appears in the input signal feature overcoming described present frame, can also to frequency domain energy process more smoothing than parameter value, specifically can adopt moving average process, the frequency domain energy getting present frame is averaged than parameter value than the frequency domain energy of parameter value with the M frame processed, and is that the frequency domain energy of the input signal of the present frame after smoothing processing compares parameter value by the average obtained.Concrete comprises:

Using the initial frequency-domain energy ratio parameter value of the ratio of described first parameter value and described second parameter value as the input signal of described present frame; To the smoothing process of described initial frequency-domain energy ratio parameter value, it comprises: being averaged than parameter value by the frequency domain energy of described initial frequency-domain energy ratio parameter value and the M frame processed calculates, and described M is positive integer; Initial frequency-domain energy ratio parameter value after smoothing processing is compared parameter value as the frequency domain energy of the input signal of described present frame.

The embodiment of the present invention described determines that the frequency domain energy of the determination input signal in the frequency domain energy of input signal corresponds in the embodiment of above-mentioned Fig. 1 S101 than the method for parameter value is than parameter value, or in the embodiment corresponding to Fig. 2, the frequency domain energy of the determination input signal of S204 compares parameter value.

The embodiment of the present invention, by above-mentioned account form, can obtain the frequency domain energy of input signal quickly and easily than parameter value, thus determine whether input signal exists electromagnetic interference, conveniently carry out the removal of the electromagnetic interference signal in follow-up input signal.

Refer to Fig. 4 again, be the schematic flow sheet of wherein a kind of concrete grammar of the interference strength parameter value of the determination input signal of the embodiment of the present invention, the described method of the embodiment of the present invention comprises:

S401: according to the frequency domain amplitude spectrum of the input signal of described present frame, calculates described electromagnetic interference frequency and the spectrum energy of harmonic frequency in the frequency domain amplitude spectrum of the input signal of described present frame;

S402: carry out read group total to the spectrum energy obtained, using the interference strength parameter value of the result of read group total as the input signal of described present frame.

Interference strength parameter value is intended to the power characterizing electromagnetic interference, in the embodiment of the present invention, use electromagnetic interference frequency and each harmonic frequency thereof in the spectrum energy sum of frequency domain amplitude spectrum corresponding to the input signal of described present frame as interference strength parameter value ener, concrete, the concrete calculation expression of interference strength parameter value ener can adopt following expression:

Sum(* wherein) represent summation operation, other parameter values and calculation expression more identical than the implication of the parameter value in parameter value fac_sp computing formula or calculation expression with above-mentioned frequency domain energy.

Further, in other embodiments, determine that the interference strength parameter value of the electromagnetic interference that input signal may exist can also adopt: described electromagnetic interference frequency and each harmonic frequency thereof are determined at the mean value of frequency domain amplitude spectrum intermediate frequency spectrum energy corresponding to the input signal of described present frame, or can also by the electromagnetic interference frequency in some frequency bands and each harmonic frequency thereof the spectrum energy of frequency domain amplitude spectrum corresponding to the input signal of described present frame and or average represent.Concrete, that is: according to the frequency domain amplitude spectrum of the input signal of described present frame, to described electromagnetic interference frequency and harmonic frequency, the spectrum energy in the frequency domain amplitude spectrum of the input signal of described present frame is averaging calculating, using the interference strength parameter value of the result of average computation as the input signal of described present frame; Or, according to the frequency domain amplitude spectrum of the input signal of described present frame, in pre-set frequency band, to described electromagnetic interference frequency and harmonic frequency, the spectrum energy in the frequency domain amplitude spectrum of the input signal of described present frame carries out read group total, using the interference strength parameter value of the result of read group total as the input signal of described present frame; Or, according to the frequency domain amplitude spectrum of the input signal of described present frame, in pre-set frequency band, to described electromagnetic interference frequency and harmonic frequency, the spectrum energy in the frequency domain amplitude spectrum of the input signal of described present frame is averaging calculating, using the interference strength parameter value of the result of average computation as the input signal of described present frame.

Wherein a kind of concrete grammar of the interference strength parameter value of the determination input signal of the embodiment of the present invention corresponds to the interference strength parameter value of the determination input signal in the S101 in the embodiment of above-mentioned Fig. 1, or the interference strength parameter value of the input signal of the determination present frame of S204 in the embodiment corresponding to Fig. 2.

The embodiment of the present invention, by above-mentioned account form, can obtain the interference strength parameter value that input signal may exist quickly and easily, thus determines that the electromagnetic interference in input signal is strong and weak, facilitates the electromagnetic interference signal in follow-up removal input signal.

Refer to Fig. 5 again, be the schematic flow sheet of wherein a kind of concrete grammar of the calculation of filtered regulation and control parameter value of the embodiment of the present invention, the described method of the embodiment of the present invention comprises:

S501: judge whether described frequency domain energy is more than or equal to default first threshold than parameter value;

Choosing of described first threshold threshold is generally empirical value, also can obtain according to data training.Whether the selection principle of described first threshold exists electromagnetic interference be as the criterion distinguishing.

When the frequency domain energy obtained is less than first threshold than parameter value fac_sp, represent there is no electromagnetic interference, now using input signal directly as reference signal, i.e. out_tmp(n)=in(n), n=0,1,2 ..., N-1.When the frequency domain energy obtained is more than or equal to first threshold than parameter value fac_sp, expresses possibility and there is electromagnetic interference, perform following S502.

S502: if described frequency domain energy is more than or equal to default first threshold than parameter value, described frequency domain energy interference more satisfied with parameter value controlled condition, compares described interference strength parameter value and the least interference intensity level preset and maximum interference intensity level.

S503: when described interference strength parameter value is less than or equal to described least interference intensity level, regulates and controls parameter value using default regulation and control parameter minimum value as filtering.

S504: when described interference strength parameter value is more than or equal to described maximum interference intensity level, regulates and controls parameter value using default regulation and control parameter maximum as filtering.

S505: when described interference strength parameter value is greater than described least interference intensity level, and when being less than described maximum interference intensity level, calculates described filtering regulation and control parameter value according to preset regulation and control parameter calculation formula.

When use comb filter processes input signal, less framing can be adopted process, to reduce the occupancy of internal memory.In the embodiment of the present invention, adopt length D as point frame length of inter-process, the time domain interval of D corresponding to electromagnetic interference frequency, the concrete expression formula of described D can be:

D = round (\frac{FS}{F_EMI});

Certainly, also inner sub-frame processing can not be carried out.

Concrete, the account form that the filtering regulation and control parameter value ρ of comb filter is concrete realizes by following expression:

ρ = \{\begin{matrix} ρ_{\min}, & ener \leq {ener}_{\min} \\ ρ_{\min} + ener * \frac{ρ_{\max} - ρ_{\min}}{{ener}_{\max} - {ener}_{\min}}, & {ener}_{\min} < ener < {ener}_{\max} \\ ρ_{\max}, & ener &GreaterEqual; {ener}_{\max} \end{matrix}

Wherein, ener _minfor the least interference intensity level preset, ener _maxfor the maximum interference intensity level preset, ρ _minfor the minimum regulation and control parameter value preset, ρ _maxfor the maximum regulation and control parameter value preset.Ener _min, ener _min, ρ _minand ρ _maxchoose and be generally empirical value, also can obtain according to data training.

After determining described filtering regulation and control parameter value ρ, comb filter can be controlled and according to filtering regulation and control parameter value ρ, filtering process is carried out to the input signal of present frame, obtain reference signal.

Wherein a kind of concrete grammar of the filtering regulation and control parameter value of the described calculating filter of the embodiment of the present invention corresponds to the S102 in the embodiment of above-mentioned Fig. 1, or corresponds to S202 and S205 in the embodiment of Fig. 2.

The embodiment of the present invention is by above-mentioned account form, can based on the interference strength parameter value of the frequency domain energy of input signal than the electromagnetic interference that may exist of parameter value and input signal, the filtering regulation and control parameter value of filter is adjusted, thus it is strong and weak according to the electromagnetic interference in input signal, complete and reference signal is obtained to the filtering operation of input signal, conveniently finally obtain input signal process output signal, calculate simple, cost is low.

Refer to Fig. 6 again, be the schematic flow sheet obtaining the wherein a kind of concrete grammar outputed signal of the embodiment of the present invention, the described method of the embodiment of the present invention comprises:

S601: the reference signal obtaining input signal.

Concrete, described S601 can comprise: determine that the frequency domain energy of the input signal of present frame under the electromagnetic interference frequency preset is than parameter value and interference strength parameter value; When described frequency domain energy interference more satisfied with parameter value controlled condition, according to described interference strength parameter value calculation filtering regulation and control parameter value; According to described filtering regulation and control parameter value, filtering is carried out to the input signal of described present frame and obtain reference signal.This carries out the reference signal that filtering obtains and specifically obtains by the described S101 to S103 in the corresponding embodiment of above-mentioned Fig. 1.

Or, described S601 can comprise: detecting that described present frame is non-speech frame, determine the interference strength parameter value of the input signal of described present frame, filtering regulation and control parameter value is obtained according to described interference strength parameter value, and according to the described filtering regulation and control parameter value calculated, the reference signal that filtering obtains non-speech frame is carried out to the input signal of described present frame, the final output signal of the input signal of described present frame is obtained according to the reference signal of described non-speech frame.The reference signal of this non-speech frame specifically can be obtained by the S202 of the corresponding embodiment of above-mentioned Fig. 2,

After obtaining filtering regulation and control parameter value ρ, can obtain the transfer function of comb filter, the expression formula of described transfer function can adopt following expression to realize:

H_{comb} (z) = \frac{{1 - 2}^{- D}}{1 - ρ^{D} z^{- D}};

Therefore, after the filtering regulation and control parameter value ρ through calculating carries out filtering to input signal, the time-domain expression of available reference signal is out_tmp(n)=in(n)-in(n-D)+ρ ^d* out_tmp(n-D).Certainly, this is a kind of expression-form of comb filter, and the value due to FS/F_EMI differs and is decided to be integer, therefore also can use the comb filter of fractional delay, and specific design method is prior art, repeats no more here.

No matter be which kind of method design comb filter out, all its transfer function can be represented becomes following expression:

H_{comb} (z) = \frac{1 - Σ_{i = 0}^{P} α (i) * z^{- i}}{1 - ρ^{D} * Σ_{i = 0}^{P} β (i) * z^{- i}};

The reference signal obtained after comb filter process is:

out_tmp (n) = in (n) - Σ_{i = 0}^{P} α (i) * in (n - i) + ρ^{D} * Σ_{i = 0}^{P} β (i) * out_tmp (n - i);

Wherein P is comb filter exponent number.

Or further, described S601 specifically can comprise: when described frequency domain energy does not meet interference controlled condition than parameter value, the input signal of described present frame is defined as reference signal.This reference signal determined specifically can be determined to obtain by the S208 of the corresponding embodiment of S105 and Fig. 2 of the corresponding embodiment of above-mentioned Fig. 1.

S602: the ratio calculating the energy of the input signal of described present frame and the energy of described reference signal.

The calculating of the signal energy of input signal and reference signal can adopt prior art to carry out, such as, can carry out the computings such as corresponding integration or summation according to signal amplitude.

The ratio obtained in described S602 and energy ratio alpha are the ratio of the energy of original input signal and the energy of reference signal, and its expression formula can be:

alpha = \sqrt{\frac{Σ_{n = 0}^{N - 1} out_tmp (n) * out_tmp (n)}{Σ_{n = 0}^{N - 1} in (n) * in (n)}};

If have employed point frame length of length D as inter-process, then need to calculate according to replacing original length N with length D.Certainly this is a kind of expression way of energy ratio, also can use other representation, such as, can adopt following expression:

alpha = \frac{Σ_{n = 0}^{N - 1} out_tmp (n) * out_tmp (n)}{Σ_{n = 0}^{N - 1} in (n) * in (n)};

The energy ratio alpha reference characterized after treatment outputs signal the difference between primary signal.

S603: if the ratio of described energy is greater than default Second Threshold, then estimate according to the signal Output rusults of the K frame processed the final output signal obtaining the input signal of described present frame.

S604: if the ratio of described energy is less than or equal to described default Second Threshold, then judge whether former frame is idle frame, and judge whether the value of hangover counter is greater than 0;

S605: if the value that former frame is idle frame or hangover counter is greater than 0, then estimate according to the signal Output rusults of the K frame processed the final output signal obtaining the input signal of described present frame;

S606: if former frame not for idle frame and hangover counter value equal 0, then using the final output signal of described reference signal as the input signal of described present frame.

Wherein, for representing that Frame is the hangover frame of idle frame when the value of described hangover counter is greater than 0.This hangover counter is in the process processed input signal each time, when judging that frame that some input signals are corresponding is as arranging during idle frame, when being judged to be idle frame each time, increase the value of hangover counter, and when being judged to be busy frame, reduce the value of hangover counter.

Concrete, such as, judge whether former frame is that idle frame is specifically as follows: when the ratio between the energy of the input signal of the former frame calculated and the energy of the reference signal of former frame is greater than default Second Threshold, or the ratio between the energy of input signal and the energy of the reference signal of former frame of the former frame calculated is greater than the average of the energy ratio parameter value of the N frame of the process of having preserved, and the average of energy ratio parameter value of the N frame of the process of preserving is when being less than the 3rd threshold value, determine that former frame is idle frame, otherwise, former frame is busy frame.When judging former frame as idle frame, preset idle frame mark is set to effectively to represent that former frame is for idle frame, and the value arranging hangover counter is a length threshold preset, this length threshold trailing length possible according to idle frame is determined, conveniently when processing the input signal of present frame, can judge in S604 after idle frame mark and hangover counter are set.

Equally, described Second Threshold is empirical value, and also can obtain according to data training, whether the selection principle of described Second Threshold is that idle frame is as the criterion can distinguish present frame.Concrete further, described Second Threshold comprises: the average of the energy ratio parameter value of the N frame of the process of preservation is preset as Second Threshold; Or, mean value during energy ratio parameter value long is preset as Second Threshold, obtained by following formulae discovery: Th2(n)=beta*th2(n-1)+(1-beta) * alpha, wherein Th2(n) represent the Second Threshold of present frame, th2(n-1) Second Threshold of former frame is represented, smoothing factor when beta is long.

When energy ratio alpha is greater than Second Threshold, estimate the final output of present frame according to the Output rusults of the K frame processed, that is: out(n)=smooth_mem(K*m), smooth_mem(*) in have recorded the output of the K frame processed.Other method can certainly be used to estimate Output rusults during idle frame, as long as ensure the continuity estimating output frame and front and back frame.Energy ratio alpha is not more than Second Threshold, if former frame is the value of idle frame or hangover counter be greater than zero (namely described present frame is the hangover frame of idle frame), then can adopt out(n equally)=smooth_mem(K*m), if and former frame not for idle frame and hangover counter value equal 0, then out(n)=out_tmp(n), namely direct reference signal of comb filter being carried out export after filtering process is as the output signal of described input signal.

After obtaining output signal corresponding to described input signal, can also comprise: upgrade idle frame mark and hangover counter values.Have updated described idle frame mark and the value of hangover counter, carry out estimated service life for the output signal of the next frame after present frame.Specifically comprise: judge whether described present frame is idle frame; If idle frame, by preset idle frame traffic sign placement for effectively to represent that described present frame is for idle frame, and the length of hangover counter is set to the length threshold preset; If busy frame, be invalid to represent that described present frame is busy frame by described preset idle frame traffic sign placement, and the value of the length of described hangover counter is subtracted one; Wherein, describedly judge whether described present frame is that idle frame comprises: determine that described present frame is idle frame when the ratio of the energy of the input signal of the described present frame calculated and the energy of described reference signal is greater than default Second Threshold, otherwise, be busy frame.

Namely when described energy ratio is greater than default Second Threshold, the described present frame in the embodiment of the present invention then can be confirmed as idle frame, and the value upgrading the hangover counter of present frame is default length, and is effective by idle frame traffic sign placement.When described energy ratio is less than or equal to default Second Threshold, described present frame in the embodiment of the present invention then can be confirmed as busy frame, and be invalid by idle frame traffic sign placement, if the value of hangover counter is more than or equal to 1, the value of hangover counter is subtracted one.So, when processing a rear Frame of this present frame, directly can judge value or the idle frame flag bit of the hangover counter of former frame (present frame), when the idle frame flag bit of last Frame is effective, or when the value of hangover counter is greater than 0, can determine that this rear Frame is the hangover processed frame after idle frame, therefore, the final output signal of the input signal of this rear Frame is then estimated to obtain according to the Output rusults of the K frame processed.When the idle frame flag bit of last Frame is invalid and the value of hangover counter equals 0, the final output signal of the input signal of this rear Frame is directly then reference signal.

The embodiment of the present invention is by above-mentioned account form, can based on the frequency domain energy of input signal than the interference strength parameter value of parameter value with the electromagnetic interference that may exist, select to adjust the filtering regulation and control parameter value of comb filter, thus complete reference signal is obtained to the filtering operation of input signal, and after obtaining reference signal, the final output signal of input signal is again determined according to reference signal and input signal, obtain the final output signal removing electromagnetic interference, calculate simple, cost is low, and the judgement of idle frame can be carried out, the suppression problem of the irregular electromagnetic interference signal produced when idle frame in the systems such as effective solution TDMA, and computation complexity is low.

Refer to Fig. 7 again, be the schematic flow sheet obtaining the wherein another kind of concrete grammar outputed signal of the embodiment of the present invention, the described method of the embodiment of the present invention comprises:

S701: obtain the reference signal that the input signal of present frame is corresponding.

It illustrates and see the description in above-mentioned S601, can be not repeated herein.

S702: calculate the ratio between the energy of described input signal and the energy of described reference signal.

The ratio obtained in described S702 and energy Ratios parameter value alpha are the ratio of energy between original input signal and reference output signal, and its expression formula can be:

alpha = \sqrt{\frac{Σ_{n = 0}^{N - 1} out_tmp (n) * out_tmp (n)}{Σ_{n = 0}^{N - 1} in (n) * in (n)}};

If have employed point frame length of length D as inter-process, then need to calculate according to replacing original length N with length D.Certainly this is a kind of expression way of energy ratio parameter value, also can use other representation, such as, can adopt following expression:

alpha = \frac{Σ_{n = 0}^{N - 1} out_tmp (n) * out_tmp (n)}{Σ_{n = 0}^{N - 1} in (n) * in (n)};

S703: if the ratio of described energy is greater than the average of the energy ratio of the N frame processed, and the average of the energy ratio of the N frame processed is when being less than the 3rd threshold value, then estimate the final output signal of the input signal of described present frame according to the signal Output rusults of the K frame processed.

S704: if the ratio of described energy is less than or equal to the average of the energy ratio of the N frame processed, or the average of the energy ratio of the N frame processed is when being more than or equal to the 3rd threshold value, judge whether former frame is idle frame further, and whether the value of the counter that judges to trail is greater than 0;

S705: if the value that former frame is idle frame or hangover counter is greater than 0, then estimate according to the signal Output rusults of the K frame processed the final output signal obtaining the input signal of described present frame; The signal Output rusults of the K frame processed is final output signal corresponding to the K frame input signal that processed over.

Whether former frame is that the value of idle frame and hangover counter is identical with the determination mode in the corresponding embodiment of Fig. 6, is not repeated herein.

S706: if former frame not for idle frame and hangover counter value equal 0, then using the final output signal of described reference signal as the input signal of described present frame.

When energy ratio alpha is greater than the average of the energy ratio of the N frame of the process of preservation, and the average of energy ratio of the N frame of the process of preserving is when being less than the 3rd threshold value, the final output of present frame is estimated according to the Output rusults of the K frame processed, that is: out(n)=smooth_mem(K*m), smooth_mem(*) in store the output of the K frame processed.Other method can certainly be used to estimate Output rusults during idle frame, as long as ensure the continuity estimating output frame and front and back frame.Energy ratio alpha is not more than the average of the energy ratio of the N frame of the process of preservation, or when the average of the energy ratio of the N frame of the process of preserving is greater than the 3rd threshold value, if former frame is the value of idle frame or hangover counter be greater than zero (namely described present frame is the hangover frame of idle frame), then can adopt out(n equally)=smooth_mem(K*m), if and former frame not for idle frame and hangover counter value equal 0, then out(n)=out_tmp(n), namely direct reference signal of comb filter being carried out export after filtering process is as the output signal of described input signal.3rd threshold value is empirical value, also can obtain according to data training.

After obtaining output signal corresponding to described input signal, can also comprise: upgrade idle frame mark and hangover counter values.Have updated described idle frame mark and the value of hangover counter, carry out estimated service life for the output signal of the next frame after present frame.Concrete comprises: judge whether described present frame is idle frame; If idle frame, by preset idle frame traffic sign placement for effectively to represent that described present frame is for idle frame, and the length of hangover counter is set to the length threshold preset; If busy frame, be invalid to represent that described present frame is busy frame by described preset idle frame traffic sign placement, and the value of the length of described hangover counter is subtracted one; Wherein, describedly judge whether described present frame is that idle frame comprises: when the ratio of the energy of the input signal of the described present frame calculated and the energy of described reference signal is greater than the average of the energy ratio parameter value of the N frame processed, and the average of the energy ratio parameter value of the N frame processed is when being less than the 3rd threshold value, determine that described present frame is idle frame, otherwise, be busy frame.

Namely the average of the energy ratio of the N frame of the process of preservation is greater than at energy ratio alpha, and the average of energy ratio parameter value of the N frame of the process of preserving is when being less than the 3rd threshold value, described present frame in the embodiment of the present invention then can be confirmed as idle frame, the value upgrading the hangover counter of present frame is default length, and is effective by idle frame traffic sign placement.The average of the energy ratio of the N frame of the process of preservation is less than or equal at described energy ratio alpha, or the average of energy ratio of the N frame of the process of preserving is when being more than or equal to the 3rd threshold value, described present frame in the embodiment of the present invention then can be confirmed as busy frame, and be invalid by idle frame traffic sign placement, if the value of hangover counter is more than or equal to 1, the value of hangover counter is subtracted one.So, when processing a rear Frame of this present frame, directly can judge value or the idle frame flag bit of the hangover counter of last data frame (present frame), when the idle frame flag of last Frame is effective, or when the value of hangover counter is greater than 0, can determine that this rear Frame is the hangover processed frame after idle frame, therefore, final output signal corresponding to the input signal of this rear Frame then Output rusults of the direct K frame according to processing is estimated to obtain.When the idle frame flag bit of last Frame is invalid and the value of hangover counter equals 0, the final output signal that the input signal of this rear Frame is corresponding is directly then reference signal.

The embodiment of the present invention is by above-mentioned account form, can based on the frequency domain energy of input signal than parameter value and interference strength parameter value, the filtering regulation and control parameter value of comb filter is adjusted, thus complete reference signal is obtained to the filtering operation of input signal, and after obtaining reference signal, again according to reference signal and the energy ratio between input signal and described reference signal, determine final output signal, obtain the final output signal removing electromagnetic interference, calculate simple, cost is low, and the judgement of idle frame can be carried out, the suppression problem of the irregular electromagnetic interference signal produced when idle frame in the systems such as effective solution TDMA, and computation complexity is low.

Refer to Fig. 8 again, it is the schematic flow sheet of another incoming signal processing method of the embodiment of the present invention, method described in the embodiment of the present invention can be applicable in communication network, by carrying out to the input signal of present frame the final output signal that signal analysis obtains this input signal, concrete, the described method of the embodiment of the present invention comprises:

S801: when detecting that present frame is non-speech frame, determines the interference strength parameter value of the input signal of described present frame;

Described S801 specifically can comprise: carry out voice activation detection to the input signal of present frame, obtain voice activation testing result vad_flag, determines whether described present frame is speech frame according to voice activation testing result.When for non-speech frame, determine the interference strength parameter value of the input signal of described present frame.

S802: calculate described interference strength parameter value, obtains filtering regulation and control parameter value, and carries out filtering to the input signal of described present frame obtain reference signal according to the filtering regulation and control parameter value calculated.

Interference strength parameter value is intended to characterize the power of electromagnetic interference, in the embodiment of the present invention, uses electromagnetic interference frequency and each harmonic frequency thereof in the spectrum energy sum of frequency domain amplitude spectrum corresponding to the input signal of described present frame as interference strength parameter value ener.In other embodiments, determine that the interference strength parameter value of input signal can also adopt: described electromagnetic interference frequency and each harmonic frequency thereof are determined at the mean value of frequency domain amplitude spectrum intermediate frequency spectrum energy corresponding to the input signal of described present frame, or can also by the electromagnetic interference frequency in some frequency bands and each harmonic frequency thereof the spectrum energy of frequency domain amplitude spectrum corresponding to the input signal of described present frame and or average represent.

Concrete, the account form that the filtering calculated in described S802 regulates and controls parameter value ρ concrete realizes by following expression:

ρ = \{\begin{matrix} ρ_{\min}, & ener \leq {ener}_{\min} \\ ρ_{\min} + ener * \frac{ρ_{\max} - ρ_{\min}}{{ener}_{\max} - {ener}_{\min}}, & {ener}_{\min} < ener < {ener}_{\max} \\ ρ_{\max}, & ener &GreaterEqual; {ener}_{\max} \end{matrix}

S803: the final output signal obtaining the input signal of described present frame according to described reference signal.

After obtaining reference signal, the reference signal exported according to filter again in S803 carries out signal transacting, determines the final output signal of the input signal of described present frame.In embodiments of the present invention, obtain the filtering regulation and control parameter value after obtaining reference signal by filter of filter at controlling calculation, the final output signal that the reference signal exported according to filter obtains described present frame can pass through existing techniques in realizing.

Concrete further, obtain the final output signal of the input signal of described present frame in described 803 according to described reference signal, can comprise:

Or, according to described reference signal, estimation process is carried out to the input signal of described present frame in described S803, obtains the final output signal of the input signal of described present frame, can comprise:

If described energy ratio is less than or equal to the average of the energy ratio of the N frame processed, or when the average of the energy ratio of the N frame processed is more than or equal to the 3rd threshold value, judge whether former frame is idle frame further, and judge whether the value of hangover counter is greater than 0;

The embodiment of the present invention can based on the interference strength parameter value of the input signal of non-speech frame, the regulation and control parameter value of comb filter is adjusted, thus complete reference signal is obtained to the filtering operation of input signal, and after obtaining reference signal, again according to reference signal and the energy ratio between input signal and described reference signal, determine final output signal, obtain the final output signal removing electromagnetic interference, calculate simple, cost is low.

Below the input signal processing unit of the embodiment of the present invention is described in detail.

Referring to Fig. 9, is the structural representation of a kind of input signal processing unit of the embodiment of the present invention.The described device of the embodiment of the present invention can be applicable in communication network, is arranged in all types of signal input-output equipment, and concrete, the described device of the embodiment of the present invention comprises:

Determination module 1, for determining that the frequency domain energy of the input signal of present frame under described electromagnetic interference frequency is than parameter value and interference strength parameter value;

Filtration module 2, for when described frequency domain energy interference more satisfied with parameter value controlled condition, according to described interference strength parameter value calculation filtering regulation and control parameter value, and according to described filtering regulation and control parameter value, filtering is carried out to the input signal of described present frame and obtain reference signal;

Processing module 3, for obtaining the final output signal of the input signal of described present frame according to described reference signal.

In the embodiment of the present invention, the sample rate FS of the input signal of present frame can be set to 8KHz, carries out sub-frame processing to signal, and frame length is N, then the input signal that present frame is corresponding is in(n), n=0,1,2 ..., N-1.The electromagnetic interference frequency preset is set to 217.

The described frequency domain energy determined in described determination module 1 comprises than parameter value: the described parameter value that spectrum energy in the frequency domain amplitude spectrum of the input signal of described present frame, half frequency of described electromagnetic interference frequency and the spectrum energy of the odd harmonic frequencies of half frequency in the frequency domain amplitude spectrum of the input signal of described present frame calculate according to electromagnetic interference frequency and harmonic frequency, and described interference strength parameter value comprises: the parameter value that the spectrum energy in the frequency domain amplitude spectrum of the input signal of described present frame calculates according to half frequency of described electromagnetic interference frequency and the odd harmonic frequencies of half frequency.

The frequency domain energy of the described input signal that described determination module 1 obtains characterizes in the frequency domain amplitude spectrum of the input signal of described present frame than parameter value, the ratio of spectrum energy between harmonic wave place spectrum energy corresponding to electromagnetic interference frequency preset and harmonic wave.

Further, described determination module 1 specifically can to calculate in the frequency domain amplitude spectrum of the input signal of described present frame in Whole frequency band, between each harmonic wave place spectrum energy and each harmonic wave of the electromagnetic interference frequency preset, the ratio of spectrum energy, obtains frequency domain energy and compares parameter value; Or calculate in the frequency domain amplitude spectrum of the input signal of described present frame within the scope of pre-set frequency band, between each harmonic wave place spectrum energy and each harmonic wave of the electromagnetic interference frequency preset, the ratio of spectrum energy, obtains frequency domain energy and compares parameter value; Or first the amplitude spectrum energy of described input signal in different frequency bands is multiplied by respectively corresponding weight coefficient, to calculate in the frequency domain amplitude spectrum of the input signal of described present frame within the scope of Whole frequency band or pre-set frequency band again, between each harmonic wave place spectrum energy and each harmonic wave of the electromagnetic interference frequency preset, the ratio of spectrum energy, obtains frequency domain energy and compares parameter value.

The power of electromagnetic interference of the interference strength parameter value that described determination module 1 obtains for characterizing described input signal and may existing.The spectrum energy sum that described default electromagnetic interference frequency and each harmonic frequency thereof can be used corresponding in the frequency domain amplitude spectrum of the input signal of described present frame is as interference strength parameter value.In addition, also can represent with the mean value of the spectrum energy corresponding in the frequency domain amplitude spectrum of the input signal of described present frame of described default electromagnetic interference frequency and each harmonic frequency thereof, or can also be represented by the frequency domain energy sum corresponding in the frequency domain amplitude spectrum of the input signal of described present frame of the described default electromagnetic interference frequency in a certain preset frequency bands or mean value.

When frequency domain energy is greater than a certain default frequency domain energy than parameter value threshold value than parameter value, need to be undertaken calculating and processing by described filtration module 2 and processing module 3; Otherwise, namely show that electromagnetic interference is enough little or do not have electromagnetic interference, the filtering regulation and control parameter value of filter need not be adjusted.

After described determination module 1 obtains interference strength parameter value, described filtration module 2 can calculate filtering regulation and control parameter value ρ according to interference strength parameter value, determine ρ value, and regulate and control parameter value ρ by such as comb filter etc. according to filtering, carry out a series of filtering process, finally export reference signal out_tmp(n), comb filter is after obtaining ρ value, and the process obtaining reference signal can adopt existing techniques in realizing.

After obtaining reference signal, described processing module 3, again according to the reference signal that filtering obtains, determines the final output signal of described input signal.Concrete, when present frame is busy frame, the final output signal of the input signal of present frame can be exactly described reference signal and out(n)=out_tmp(n), n=0,1,2 ..., N-1, for then can obtain the final output signal of the input signal of described present frame during idle frame according to the output signal of the K frame processed, out(n)=smooth_mem(K*m), wherein, at described smooth_mem(*) in have recorded the output of the K frame processed.Other method can certainly be used to estimate Output rusults during idle frame, as long as ensure the continuity of the frame of estimated output signal and front and back signal.Whether present frame is that idle frame can be determined according to modes such as the sizes of the frequency domain amplitude spectrum capacity volume variance between input signal and reference signal.

Further, then referring to Figure 10, is the structural representation of the another kind of input signal processing unit of the embodiment of the present invention.The described device of the embodiment of the present invention can be applicable in communication network, is arranged in all types of signal input-output equipment, and the device described in the embodiment of the present invention comprises determination module 1, filtration module 2 and processing module 3 in an embodiment.Further, in the embodiment of the present invention, the sample rate FS of the input signal of present frame can be set to 8KHz, carries out sub-frame processing to signal, and frame length is N, then the input signal that present frame is corresponding is in(n)=0,1,2 ..., N-1.

Further, in embodiments of the present invention, described device can also comprise:

Whether detection module 4 is speech frame for detecting described present frame;

Notification module 5, for when the testing result of described detection module 4 is for being speech frame, notifies that the frequency domain energy of the input signal of described determination module determination present frame under the electromagnetic interference frequency preset is than parameter value and interference strength parameter value;

Non-speech frame processing module 6, for when the testing result of described detection module 4 is for being not speech frame, determine the interference strength parameter value of the input signal of described present frame, filtering regulation and control parameter value is obtained according to described interference strength parameter value, and according to the described filtering regulation and control parameter value calculated, filtering is carried out to the input signal of described present frame and obtain reference signal, the final output signal of the input signal of described present frame is obtained according to described reference signal.

Described detection module 4 specifically can carry out voice activation detection by the input signal corresponding to present frame, obtain voice activation testing result vad_flag, determine whether the current Frame of described input signal is speech frame according to voice activation testing result, if speech frame, then notify that described determination module 1 determines that the frequency domain energy of input signal is than parameter value and interference strength parameter value by described notification module 5, described filtration module 2 and processing module 3 carry out the corresponding filtering regulation and control calculating of parameter value and the process of signal, obtain the final output signal of the input signal of described present frame.

If not speech frame, then by described non-speech frame processing module 6, this non-speech frame is processed.When described non-speech frame processing module 6 determines the interference strength parameter value of described input signal, the energy sum of described default electromagnetic interference frequency (generally can be set to 217KHz) and frequency domain amplitude spectrum corresponding to each harmonic frequency thereof can be used to obtain interference strength parameter value.In addition, also can represent with the mean value of the electromagnetic interference frequency preset and spectrum energy corresponding to each harmonic frequency thereof, or can also be represented by the spectrum energy sum of the electromagnetic interference frequency in a certain preset frequency bands or average.

Further alternatively, refer to Figure 10, the described device of the embodiment of the present invention can also comprise:

Described processing module 3, also for when described frequency domain energy does not meet interference controlled condition than parameter value, is defined as reference signal by the input signal of described present frame; The final output signal of the input signal of described present frame is obtained according to the described reference signal determined.

Described input signal directly exports as with reference to signal by described processing module 3, namely obtains reference signal out_tmp(n)=in(n), n=0,1,2 ..., N-1, in(n) and represent described input signal.Then the final output signal of the input signal of described present frame is determined according to this reference signal.In embodiments of the present invention, when not meeting interference controlled condition, described processing module 3 can also have other processing modes, such as, directly exported by described input signal, or obtains output corresponding to the described input signal of present frame according to the Frame of former frame.

Further alternatively, as shown in figure 11, be wherein a kind of concrete structure schematic diagram of the determination module in Figure 10, the described determination module 1 of the embodiment of the present invention is when determining the frequency domain energy of input signal than parameter value, and described determination module 1 can comprise:

Amplitude spectrum determining unit 11, for determining the frequency domain amplitude spectrum of the input signal of described present frame;

First parameter calculation unit 12, for obtaining the first parameter value according to described frequency domain amplitude spectrum, described first parameter value comprises: the mean value of described electromagnetic interference frequency and the spectrum energy of harmonic frequency in the frequency domain amplitude spectrum of the input signal of described present frame thereof or the weighted average obtained according to preset weight coefficient, or the mean value comprising the spectrum energy in described electromagnetic interference frequency and the pre-set frequency band of harmonic frequency in the frequency domain amplitude spectrum of the input signal of described present frame thereof or the weighted average obtained according to preset weight coefficient;

Second parameter calculation unit 13, for obtaining the second parameter value according to described frequency domain amplitude spectrum, described second parameter value comprises: the mean value of half frequency of described electromagnetic interference frequency and the spectrum energy of the odd harmonic frequencies of half frequency in the frequency domain amplitude spectrum of the input signal of described present frame or the weighted average obtained according to preset weight coefficient, or the mean value of the spectrum energy in half frequency of described electromagnetic interference frequency and the pre-set frequency band of the odd harmonic frequencies of half frequency in the frequency domain amplitude spectrum of the input signal of described present frame or the weighted average obtained according to preset weight coefficient,

Energy ratio parameter determining unit 14, compares parameter value for the frequency domain energy obtaining the input signal of described present frame according to the ratio of described first parameter value and described second parameter value.

Concrete further, described first parameter calculation unit 12, specifically for calculating the sampling point of described electromagnetic interference frequency and harmonic frequency correspondence in the frequency domain amplitude spectrum of the input signal of described present frame thereof, determine the spectrum energy of each sampling point in the frequency domain amplitude spectrum of the input signal of described present frame, and using the mean value of the spectrum energy of each sampling point determined as the first parameter value;

Described second parameter calculation unit 13, specifically for the sampling point that the odd harmonic frequencies of half frequency and half frequency that calculate described electromagnetic interference frequency is corresponding in the frequency domain amplitude spectrum of the input signal of described present frame, determine the spectrum energy of each sampling point in the frequency domain amplitude spectrum of the input signal of described present frame, and using the mean value of the spectrum energy of each sampling point determined as the second parameter value.

Described energy ratio parameter determining unit 14, specifically for using the initial frequency-domain energy ratio parameter value of the ratio of described first parameter value and described second parameter value as the input signal of described present frame; To the smoothing process of described initial frequency-domain energy ratio parameter value, it comprises: being averaged than parameter value by the frequency domain energy of described initial frequency-domain energy ratio parameter value and the M frame processed calculates, and described M is positive integer; Initial frequency-domain energy ratio parameter value after smoothing processing is compared parameter value as the frequency domain energy of the input signal of described present frame.

Further, then refer to Figure 10, described determination module 1 is when determining the interference strength parameter value of input signal, and described determination module 1 specifically can comprise:

Interference strength determining unit 15, for the frequency domain amplitude spectrum of the input signal according to described present frame, to described electromagnetic interference frequency and harmonic frequency, the spectrum energy in the frequency domain amplitude spectrum of the input signal of described present frame carries out read group total, using the interference strength parameter value of the result of read group total as the input signal of described present frame; For the frequency domain amplitude spectrum of the input signal according to described present frame, to described electromagnetic interference frequency and harmonic frequency, the spectrum energy in the frequency domain amplitude spectrum of the input signal of described present frame is averaging calculating, using the interference strength parameter value of the result of average computation as the input signal of described present frame;

Or,

The method that the specific implementation of above-mentioned each unit of described determination module 1 can refer in method item embodiment realizes, and is not repeated herein.

Further, then refer to Figure 12, be wherein a kind of concrete structure schematic diagram of the filtration module in Figure 10, described filtration module 2 specifically can comprise:

Comparing unit 21, for when described frequency domain energy is more than or equal to default first threshold than parameter value, described frequency domain energy interference more satisfied with parameter value controlled condition, compares described interference strength parameter value and the least interference intensity level preset and maximum interference intensity level;

Regulation and control parameter value-determining unit 22, for when described interference strength parameter value is less than or equal to described least interference intensity level, regulates and controls parameter value using default regulation and control parameter minimum value as filtering; When described interference strength parameter value is more than or equal to described maximum interference intensity level, default regulation and control parameter maximum is regulated and controled parameter value as filtering; When described interference strength parameter value is greater than described least interference intensity level, and when being less than described maximum interference intensity level, calculate described filtering regulation and control parameter value according to preset regulation and control parameter calculation formula;

Filter unit 23, obtains reference signal for carrying out filtering according to described filtering regulation and control parameter value to the input signal of described present frame.

Choosing of described first threshold threshold is generally empirical value, also can obtain according to data training, and whether the selection principle of described first threshold exists electromagnetic interference be as the criterion distinguishing.

Described comparing unit 21, when the frequency domain energy obtained is less than first threshold than parameter value fac_sp, represents do not have electromagnetic interference, now using input signal directly as reference signal, i.e. out_tmp(n)=in(n), n=0,1,2 ..., N-1.When the frequency domain energy obtained is more than or equal to first threshold than parameter value fac_sp, expresses possibility and there is electromagnetic interference.

The 23 pairs of filtering of described regulation and control parameter value-determining unit regulate and control the concrete account form of parameter value ρ and with reference to the description of the regulation and control of the filtering about the comb filter parameter value ρ in the corresponding embodiment of Fig. 5, can be not repeated herein.

Further, then refer to Figure 13, be wherein a kind of concrete structure schematic diagram of the processing module in Figure 10, described processing module 3 specifically can comprise:

First energy ratio computing unit 31, for the ratio of the energy of the energy and described reference signal that calculate the input signal of described present frame;

First processing unit 32, if be greater than default Second Threshold for the ratio of described energy, then estimates according to the signal Output rusults of the K frame processed the final output signal obtaining the input signal of described present frame; If the ratio of described energy is less than or equal to described default Second Threshold, then judge whether former frame is idle frame, and judge whether the value of hangover counter is greater than 0; If former frame is the value of idle frame or hangover counter be greater than 0, then estimate according to the signal Output rusults of the K frame processed the final output signal obtaining the input signal of described present frame; If former frame is not for idle frame and the value of hangover counter equals 0, then using the final output signal of described reference signal as the input signal of described present frame; Wherein, for representing that Frame is the hangover frame of idle frame when the value of described hangover counter is greater than 0.

After obtaining filtering regulation and control parameter value ρ, namely according to the filtering regulation and control parameter value calculated, filtering is carried out to described input signal by filter, and export reference signal.

Described Second Threshold is empirical value, and also can obtain according to data training, whether the selection principle of described Second Threshold is that idle frame is as the criterion can distinguish present frame.Concrete further, described Second Threshold comprises: the average of the energy ratio of the N frame of the process of preservation is preset as Second Threshold; Or, mean value during energy ratio long is preset as Second Threshold, obtained by following formulae discovery: Th2(n)=beta*th2(n-1)+(1-beta) * alpha, wherein Th2(n) represent the Second Threshold of present frame, th2(n-1) Second Threshold of former frame is represented, smoothing factor when beta is long, alpha is the energy ratio between described input signal and described reference signal.

The concrete account form of the energy ratio alpha that described first energy ratio computing unit 31 calculates can adopt the account form in the corresponding embodiment of Fig. 6, is not repeated herein.

The energy ratio alpha calculated when the first energy ratio computing unit 31 is greater than Second Threshold, first processing unit 32 estimates the final output of present frame according to the Output rusults of the K frame processed, that is: out(n)=smooth_mem(K*m), smooth_mem(*) in store the output of the K frame processed.Other method can certainly be used to estimate Output rusults during idle frame, as long as ensure the continuity estimating output frame and front and back frame.Energy Ratios ginseng value alpha is not more than Second Threshold, then out(n)=out_tmp(n), namely direct reference signal of comb filter being carried out export after filtering process is as the output signal of described input signal.

Further, then refer to Figure 13, described processing module 3 specifically can also comprise:

Second energy ratio computing unit 33, for the ratio of the energy of the energy and described reference signal that calculate the input signal of described present frame;

Second processing unit 34, if the ratio for described energy is greater than the average of the energy ratio of the N frame processed, and the average of the energy ratio of the N frame processed is when being less than the 3rd threshold value, then estimate the final output signal of the input signal of described present frame according to the signal Output rusults of the K frame processed; If the ratio of described energy is less than or equal to the average of the energy ratio of the N frame processed, or the average of the energy ratio of the N frame processed is when being more than or equal to the 3rd threshold value, judge whether former frame is idle frame further, and whether the value of the counter that judges to trail is greater than 0; If former frame is the value of idle frame or hangover counter be greater than 0, then estimate according to the signal Output rusults of the K frame processed the final output signal obtaining the input signal of described present frame; If former frame is not for idle frame and the value of hangover counter equals 0, then using the final output signal of described reference signal as the input signal of described present frame; Wherein, for representing that Frame is the hangover frame of idle frame when the value of described hangover counter is greater than 0.

The concrete account form of the energy ratio alpha that described second energy ratio computing unit 33 calculates can adopt the account form in the corresponding embodiment of Fig. 7, is not repeated herein.

Further, refer to Figure 13, described processing module 3 can also comprise:

Judging unit 35, for judging whether described present frame is idle frame;

Updating block 36, when being idle frame for judged result, by preset idle frame traffic sign placement for effectively to represent that described present frame is for idle frame, and is set to the length threshold preset by the length of hangover counter; If busy frame, be invalid to represent that described present frame is busy frame by described preset idle frame traffic sign placement, and the value of the length of described hangover counter is subtracted one;

Wherein, when described updating block is greater than default Second Threshold specifically for the ratio of the energy of the input signal when the described present frame calculated and the energy of described reference signal; Or when the energy of input signal of described present frame calculated and the ratio of the energy of described reference signal are greater than the average of the energy ratio of the N frame processed, and the average of the energy ratio of the N frame processed is when being less than the 3rd threshold value, determine that described present frame is idle frame, otherwise, be busy frame.

Described present frame in the embodiment of the present invention is confirmed as idle frame, and the value upgrading the hangover counter of present frame is default length, and is effective by idle frame traffic sign placement.Being confirmed as busy frame at described present frame, is invalid by idle frame traffic sign placement, if the value of hangover counter is more than or equal to 1, the value of hangover counter is subtracted one.So, when processing a rear Frame of this present frame, directly can judge hangover counter heights or the idle frame flag bit of last data frame (present frame), when the idle frame flag of last Frame is effective, or when the value of hangover counter is greater than 0, can determine that this rear Frame is the hangover processed frame after idle frame, therefore, the final output signal of the input signal of this rear Frame then Output rusults of the direct K frame according to processing is estimated to obtain.When the idle frame flag bit of last Frame is invalid and the value of hangover counter equals 0, the final output signal of the input signal of this rear Frame is directly then reference signal.

Further, then refer to Figure 14, be the structural representation of the processing unit of another input signal of the embodiment of the present invention, described device can be applicable in communication network, and be arranged in all types of signal input-output equipment, described device comprises:

Determination module 01, for when detecting that present frame is non-speech frame, determines the interference strength parameter value of the input signal of described present frame;

Filtration module 02, for calculating described interference strength parameter value, obtains filtering regulation and control parameter value; According to the filtering regulation and control parameter value calculated, filtering is carried out to the input signal of described present frame and obtain reference signal;

Processing module 03, for obtaining the final output signal of the input signal of described present frame according to described reference signal.

Described determination module 01 specifically may be used for carrying out voice activation detection to the input signal of present frame, obtains voice activation testing result vad_flag, determines whether described present frame is speech frame according to voice activation testing result.

The interference strength parameter value that described determination module 01 is determined is intended to the power characterizing the electromagnetic interference that may exist, in the embodiment of the present invention, use electromagnetic interference frequency and each harmonic frequency thereof in the spectrum energy sum of frequency domain amplitude spectrum corresponding to the input signal of described present frame as interference strength parameter value ener.In other embodiments, determine that the interference strength parameter value of input signal can also adopt: described electromagnetic interference frequency and each harmonic frequency thereof are determined at the mean value of frequency domain amplitude spectrum intermediate frequency spectrum energy corresponding to the input signal of described present frame, or can also by the electromagnetic interference frequency in some frequency bands and each harmonic frequency thereof the spectrum energy of frequency domain amplitude spectrum corresponding to the input signal of described present frame and or average represent.

Concrete, the account form that the filtering that described filtration module 02 obtains regulates and controls parameter value ρ concrete realizes by following expression:

ρ = \{\begin{matrix} ρ_{\min}, & ener \leq {ener}_{\min} \\ ρ_{\min} + ener * \frac{ρ_{\max} - ρ_{\min}}{{ener}_{\max} - {ener}_{\min}}, & {ener}_{\min} < ener < {ener}_{\max} \\ ρ_{\max}, & ener &GreaterEqual; {ener}_{\max} \end{matrix}

After determining described filtering regulation and control parameter value ρ, described filtration module 02 can control comb filter and carry out filtering process according to filtering regulation and control parameter value ρ to the input signal of present frame, obtains reference signal.

After obtaining reference signal, the reference signal that described processing module 03 exports according to filter again carries out signal transacting, determines the final output signal of the input signal of described present frame.In embodiments of the present invention, obtain the filtering regulation and control parameter value after obtaining reference signal by filter of filter at controlling calculation, the final output signal that the reference signal exported according to filter obtains described present frame can pass through existing techniques in realizing.

Alternatively, described processing module 03 specifically can comprise:

Or alternatively.Described processing module 03 specifically can comprise:

Refer to Figure 16 again, it is the structure composition schematic diagram of a kind of network equipment of the embodiment of the present invention, the described network equipment of the embodiment of the present invention can be applicable in various types of communication network, concrete, the described network equipment comprises: input unit 100, output device 200 and processor 300, wherein, described input unit 100 is for receiving present frame, described output device 200 for exporting final output signal, described processor 300 perform time, for:

Further, described processor 300 perform described determine the input signal of present frame preset electromagnetic interference frequency under frequency domain energy than parameter value and interference strength parameter value before, also for:

Detect whether present frame is speech frame;

Detecting that described present frame is non-speech frame, determine the interference strength parameter value of the input signal of described present frame, filtering regulation and control parameter value is obtained according to described interference strength parameter value, and according to the described filtering regulation and control parameter value calculated, the reference signal that filtering obtains non-speech frame is carried out to the input signal of described present frame, the final output signal of the input signal of described present frame is obtained according to the reference signal of described non-speech frame.

Further alternatively, described processor 300 also for:

Further alternatively, described processor 300 when for determining the frequency domain energy of input signal than parameter value, specifically for:

Further, described processor 300 when for obtaining the first parameter value according to described frequency domain amplitude spectrum, specifically for:

Described processor 300 when for obtaining the second parameter value according to described frequency domain amplitude spectrum, specifically for:

Further, described processor 300 when the frequency domain energy for obtaining the input signal of described present frame according to the ratio of described first parameter value and described second parameter value is than parameter value, specifically for:

Further, described processor 300 when for determining interference strength parameter value, specifically for:

Or,

Further, described processor 300 for during when described frequency domain energy interference more satisfied with parameter value controlled condition, during according to described interference strength parameter value calculation filtering regulation and control parameter value, specifically for:

Further alternatively, described processor 300 for carrying out estimation process according to described reference signal to the input signal of described present frame, when obtaining the final output signal of the input signal of described present frame, specifically for:

Or, described processor 300 when the final output signal of the input signal for obtaining described present frame according to reference signal, specifically for:

Further alternatively, described processor 300 also for:

Judge whether described present frame is idle frame;

When the ratio of the energy of the input signal of the described present frame calculated and the energy of described reference signal is greater than default Second Threshold; Or when the energy of input signal of described present frame calculated and the ratio of the energy of described reference signal are greater than the average of the energy ratio of the N frame processed, and the average of the energy ratio of the N frame processed is when being less than the 3rd threshold value, determine that described present frame is idle frame, otherwise, be busy frame.

Refer to Figure 17 again, it is the structural representation of the another kind of network equipment of the embodiment of the present invention, the described network equipment of the embodiment of the present invention comprises: input unit 400, output device 500 and processor 600, wherein, described input unit 400 is for receiving present frame, described output device 500 for exporting final output signal, described processor 600 specifically for:

Described processor 600 when the final output signal of the input signal for obtaining described present frame according to described reference signal, specifically for:

Described processor 600 for carrying out estimation process according to described reference signal to the input signal of described present frame, when obtaining the final output signal of the input signal of described present frame, specifically for:

If described energy ratio is greater than the average of the energy ratio of the N frame processed, and the average of the energy ratio of the N frame processed is when being less than the 3rd threshold value, then estimate the final output signal of the input signal of described present frame according to the signal Output rusults of the K frame processed;

The embodiment of the present invention utilizes input signal and electromagnetic interference signal power thereof to detect, control to use the filter with different noise suppressed degree to carry out filtering to input signal, effectively can remove the electromagnetic interference in input signal, reduce speech damage, and farthest remove electromagnetic interference, and computation complexity is low, need not adopt shield technology, cost reduces.And differentiated treatment can be carried out based on speech frame and non-speech frame, reduce the complexity of calculating further, the frequency domain energy of input signal is wherein simpler, quick than the interference strength parameter value calculation of parameter value and input signal, but also the judgement of idle frame can be carried out, the suppression problem of the irregular electromagnetic interference signal produced when idle frame in the systems such as effective solution TDMA, and computation complexity is low.

One of ordinary skill in the art will appreciate that all or part of flow process realized in above-described embodiment method, that the hardware that can carry out instruction relevant by computer program has come, described program can be stored in a computer read/write memory medium, this program, when performing, can comprise the flow process of the embodiment as above-mentioned each side method.Wherein, described storage medium can be magnetic disc, CD, read-only store-memory body (Read-Only Memory, ROM) or random store-memory body (Random Access Memory, RAM) etc.

Above disclosedly be only present pre-ferred embodiments, certainly can not limit the interest field of the present invention with this, therefore according to the equivalent variations that the claims in the present invention are done, still belong to the scope that the present invention is contained.

Claims

1. a processing method for input signal, is characterized in that, comprising:

2. the method for claim 1, is characterized in that, described determine the input signal of present frame preset electromagnetic interference frequency under frequency domain energy than parameter value and interference strength parameter value before, described method also comprises:

Detect whether present frame is speech frame;

3. method as claimed in claim 1 or 2, is characterized in that, also comprise:

4. the method as described in any one of claims 1 to 3, is characterized in that, described determine the input signal of present frame preset electromagnetic interference frequency under frequency domain energy than in parameter value and interference strength parameter value, determine that frequency domain energy is than parameter value, comprising:

5. method as claimed in claim 4, is characterized in that,

Describedly obtain the first parameter value according to described frequency domain amplitude spectrum, comprising:

6. the method as described in claim 4 or 5, is characterized in that, the described ratio according to described first parameter value and described second parameter value obtains the frequency domain energy of the input signal of described present frame than parameter value, comprising:

7. the method as described in any one of claim 1 to 6, is characterized in that, described determine the input signal of present frame preset electromagnetic interference frequency under frequency domain energy than in parameter value and interference strength parameter value, determine interference strength parameter value, comprising:

Or,

8. the method as described in any one of claim 1 to 7, is characterized in that, described when described frequency domain energy interference more satisfied with parameter value controlled condition, according to described interference strength parameter value calculation filtering regulation and control parameter value, comprising:

9. the method as described in any one of claim 1-8, is characterized in that, obtains the final output signal of the input signal of described present frame, comprising according to reference signal:

10. the method as described in any one of claim 1-8, is characterized in that, obtains the final output signal of the input signal of described present frame, comprising according to reference signal:

11. methods as described in claim 9 or 10, it is characterized in that, described method also comprises:

Judge whether described present frame is idle frame;

The processing method of 12. 1 kinds of input signals, is characterized in that, comprising:

13. methods as claimed in claim 12, it is characterized in that, the described final output signal obtaining the input signal of described present frame according to described reference signal, comprising:

14. methods as claimed in claim 12, is characterized in that, describedly carry out estimation process according to described reference signal to the input signal of described present frame, obtain the final output signal of the input signal of described present frame, comprising:

15. 1 kinds of input signal processing unit, is characterized in that, comprising:

16. devices as claimed in claim 15, is characterized in that, also comprise:

Whether detection module is speech frame for detecting described present frame;

17. devices as described in claim 15 or 16, is characterized in that,

Described processing module, also for when described frequency domain energy does not meet interference controlled condition than parameter value, is defined as reference signal by the input signal of described present frame; The final output signal of the input signal of described present frame is obtained according to the described reference signal determined.

18. devices as described in any one of claim 15 to 17, it is characterized in that, described determination module comprises:

19. devices as claimed in claim 18, is characterized in that,

20. devices as described in claim 18 or 19, is characterized in that,

Described energy ratio parameter determining unit, specifically for using the initial frequency-domain energy ratio parameter value of the ratio of described first parameter value and described second parameter value as the input signal of described present frame; To the smoothing process of described initial frequency-domain energy ratio parameter value, it comprises: being averaged than parameter value by the frequency domain energy of described initial frequency-domain energy ratio parameter value and the M frame processed calculates, and described M is positive integer; Initial frequency-domain energy ratio parameter value after smoothing processing is compared parameter value as the frequency domain energy of the input signal of described present frame.

21. devices as described in any one of claim 15 to 17, it is characterized in that, described determination module also comprises:

Or,

22. devices as described in any one of claim 15 to 21, it is characterized in that, described filtration module comprises:

23. devices as described in any one of claim 15 to 21, it is characterized in that, described processing module comprises:

First energy ratio computing unit, for the ratio of the energy of the energy and described reference signal that calculate the input signal of described present frame;

24. devices as described in any one of claim 15 to 21, it is characterized in that, described processing module comprises:

Second energy ratio computing unit, for the ratio of the energy of the energy and described reference signal that calculate the input signal of described present frame;

25. devices as described in claim 23 or 24, it is characterized in that, described processing module also comprises:

Judging unit, for judging whether described present frame is idle frame;

The processing unit of 26. 1 kinds of input signals, is characterized in that, comprising:

27. devices as claimed in claim 26, it is characterized in that, described processing module comprises:

28. devices as claimed in claim 26, it is characterized in that, described processing module comprises: